eliminate compiler warning

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@44973 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -4401,7 +4401,7 @@ static void parse_request(struct sip_request *req)
 		else if (*c == '\n') { /* end of this line */
 			*c = '\0';
 			if (sipdebug && option_debug > 3)
-				ast_log(LOG_DEBUG, "%7s %2d [%3d]: %s\n",
+				ast_log(LOG_DEBUG, "%7s %2d [%3zd]: %s\n",
 					req->headers < 0 ? "Header" : "Body",
 					i, strlen(dst[i]), dst[i]);
 			if (ast_strlen_zero(dst[i]) && req->headers < 0) {