Unconditionally initialize addr to handle the case of changed map

timestamp while the map is unlocked.

Reported by:	bz
Sponsored by:	The FreeBSD Foundation
MFC after:	6 days

sys/kern/kern_proc.c

@@ -2173,6 +2173,7 @@ kern_proc_vmmap_out(struct proc *p, struct sbuf *sb)
 		if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
 			continue;
 
+		addr = entry->end;
 		bzero(kve, sizeof(*kve));
 		obj = entry->object.vm_object;
 		if (obj != NULL) {