fix compiler warning (bug #4682)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/v1-0@6109 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_voicemail.c

@@ -2270,7 +2270,7 @@ static int forward_message(struct ast_channel *chan, char *context, char *dir, i
 	char callerid[512];
 	char ext_context[256]="";
 	int res = 0, cmd = 0;
-	struct ast_vm_user *receiver, *extensions = NULL, *vmtmp = NULL, *vmfree;
+	struct ast_vm_user *receiver = NULL, *extensions = NULL, *vmtmp = NULL, *vmfree;
 	char tmp[256];
 	char *stringp, *s;
 	int saved_messages = 0, found = 0;