Make this WARNS=2 clean by:

- including <timeconv.h> to get _long_to_time prototype
	- removing an unused variable

Bump WARNS to it keep clean.

Approved by:	ume on ipfw@

sbin/ip6fw/Makefile

@@ -1,7 +1,7 @@
 # $FreeBSD$
 
 PROG=   ip6fw
-WARNS?=	0
+WARNS?=	2
 MAN=	ip6fw.8
 
 .include <bsd.prog.mk>

sbin/ip6fw/ip6fw.c

@@ -68,6 +68,7 @@
 #include <stdarg.h>
 #include <string.h>
 #include <time.h>
+#include <timeconv.h>
 #include <unistd.h>
 #include <errno.h>
 #include <signal.h>
@@ -839,8 +840,6 @@ fill_iface(char *which, union ip6_fw_if *ifu, int *byname, int ac, char *arg)
 		ifu->fu_via_ip6 = in6addr_any;
 		*byname = 0;
 	} else if (!isdigit(*arg)) {
-		char *q;
-
 		*byname = 1;
 		strlcpy(ifu->fu_via_if.name, arg, sizeof(ifu->fu_via_if.name));
 		/*