Move the duplicate definition of struct sockaddr_storage to its own

include file, and include this where the previous duplicate definitions were.

Static program checkers like FlexeLint rightfully take a dim view of
duplicate definitions, even if they currently are identical.

sys/netinet/in.h

@@ -89,27 +89,7 @@ typedef	__socklen_t	socklen_t;
 #define	_SOCKLEN_T_DECLARED
 #endif
 
-/* Avoid collision with original definition in sys/socket.h. */
-#ifndef	_STRUCT_SOCKADDR_STORAGE_DECLARED
-/*
- * RFC 2553: protocol-independent placeholder for socket addresses
- */
-#define	_SS_MAXSIZE	128U
-#define	_SS_ALIGNSIZE	(sizeof(__int64_t))
-#define	_SS_PAD1SIZE	(_SS_ALIGNSIZE - sizeof(unsigned char) - \
-			    sizeof(sa_family_t))
-#define	_SS_PAD2SIZE	(_SS_MAXSIZE - sizeof(unsigned char) - \
-			    sizeof(sa_family_t) - _SS_PAD1SIZE - _SS_ALIGNSIZE)
-
-struct sockaddr_storage {
-	unsigned char	ss_len;		/* address length */
-	sa_family_t	ss_family;	/* address family */
-	char		__ss_pad1[_SS_PAD1SIZE];
-	__int64_t	__ss_align;	/* force desired struct alignment */
-	char		__ss_pad2[_SS_PAD2SIZE];
-};
-#define	_STRUCT_SOCKADDR_STORAGE_DECLARED
-#endif
+#include <sys/_sockaddr_storage.h>
 
 /* Socket address, internet style. */
 struct sockaddr_in {

sys/sys/_sockaddr_storage.h

@@ -0,0 +1,54 @@
+/*-
+ * Copyright (c) 1982, 1985, 1986, 1988, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)socket.h	8.4 (Berkeley) 2/21/94
+ * $FreeBSD$
+ */
+
+#ifndef _SYS__SOCKADDR_STORAGE_H_
+#define	_SYS__SOCKADDR_STORAGE_H_
+
+/*
+ * RFC 2553: protocol-independent placeholder for socket addresses
+ */
+#define	_SS_MAXSIZE	128U
+#define	_SS_ALIGNSIZE	(sizeof(__int64_t))
+#define	_SS_PAD1SIZE	(_SS_ALIGNSIZE - sizeof(unsigned char) - \
+			    sizeof(sa_family_t))
+#define	_SS_PAD2SIZE	(_SS_MAXSIZE - sizeof(unsigned char) - \
+			    sizeof(sa_family_t) - _SS_PAD1SIZE - _SS_ALIGNSIZE)
+
+struct sockaddr_storage {
+	unsigned char	ss_len;		/* address length */
+	sa_family_t	ss_family;	/* address family */
+	char		__ss_pad1[_SS_PAD1SIZE];
+	__int64_t	__ss_align;	/* force desired struct alignment */
+	char		__ss_pad2[_SS_PAD2SIZE];
+};
+
+#endif /* !_SYS__SOCKADDR_STORAGE_H_ */

sys/sys/socket.h

@@ -290,26 +290,7 @@ struct sockproto {
 };
 #endif
 
-#ifndef	_STRUCT_SOCKADDR_STORAGE_DECLARED
-/*
- * RFC 2553: protocol-independent placeholder for socket addresses
- */
-#define	_SS_MAXSIZE	128U
-#define	_SS_ALIGNSIZE	(sizeof(__int64_t))
-#define	_SS_PAD1SIZE	(_SS_ALIGNSIZE - sizeof(unsigned char) - \
-			    sizeof(sa_family_t))
-#define	_SS_PAD2SIZE	(_SS_MAXSIZE - sizeof(unsigned char) - \
-			    sizeof(sa_family_t) - _SS_PAD1SIZE - _SS_ALIGNSIZE)
-
-struct sockaddr_storage {
-	unsigned char	ss_len;		/* address length */
-	sa_family_t	ss_family;	/* address family */
-	char		__ss_pad1[_SS_PAD1SIZE];
-	__int64_t	__ss_align;	/* force desired struct alignment */
-	char		__ss_pad2[_SS_PAD2SIZE];
-};
-#define	_STRUCT_SOCKADDR_STORAGE_DECLARED
-#endif
+#include <sys/_sockaddr_storage.h>
 
 #if __BSD_VISIBLE
 /*