ipfw(8): Handle unaligned pointers in pr_u64.

struct _ipfw_dyn_rule is defined as packed, and as a result, its
uint64_t fields are misaligned on some 32-bit platforms.  Since
pr_u64() is explicitly supposed to handle this case, avoid using a
uint64_t * for the input pointer to make sure that the compiler won't
(correctly) warn about the misalignment.

Reported by:	jenkins
MFC with:	r363164

sbin/ipfw/ipfw2.c

@@ -501,7 +501,7 @@ bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg)
  * otherwise, return the required width.
  */
 int
-pr_u64(struct buf_pr *b, uint64_t *pd, int width)
+pr_u64(struct buf_pr *b, void *pd, int width)
 {
 #ifdef TCC
 #define U64_FMT "I64"

sbin/ipfw/ipfw2.h

@@ -328,7 +328,7 @@ struct buf_pr {
 	size_t	needed;	/* length needed */
 };
 
-int pr_u64(struct buf_pr *bp, uint64_t *pd, int width);
+int pr_u64(struct buf_pr *bp, void *pd, int width);
 int bp_alloc(struct buf_pr *b, size_t size);
 void bp_free(struct buf_pr *b);
 int bprintf(struct buf_pr *b, const char *format, ...);