fix a pointer signedness issue

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@37287 65c4cc65-6c06-0410-ace0-fbb531ad65f3

http.c

@@ -461,7 +461,7 @@ static void *http_root(void *data)
 {
 	int fd;
 	struct sockaddr_in sin;
-	int sinlen;
+	socklen_t sinlen;
 	struct ast_http_server_instance *ser;
 	pthread_t launched;
 	pthread_attr_t attr;