Move #ifdef _KERNEL higher in socketvar.h to cover various socket

buffer related macros.

sys/sys/socketvar.h

@@ -232,6 +232,8 @@ struct xsocket {
 	uid_t	so_uid;		/* XXX */
 };
 
+#ifdef _KERNEL
+
 /*
  * Macros for sockets and socket buffering.
  */
@@ -348,8 +350,6 @@ struct xsocket {
 		sowakeup((so), &(so)->so_snd); 				\
 } while (0)
 
-#ifdef _KERNEL
-
 /*
  * Argument structure for sosetopt et seq.  This is in the KERNEL
  * section because it will never be visible to user code.