Fix not being able to specify a URL in MOH class directory.

Don't attempt to chdir on a URL!

(closes issue #16875)
Reported by: raarts
Patches: 
      moh-http.patch uploaded by raarts (license 937)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@250786 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_musiconhold.c

@@ -457,7 +457,7 @@ static int spawn_mp3(struct mohclass *class)
 #ifdef HAVE_CAP
 		cap_t cap;
 #endif
-		if (strcasecmp(class->dir, "nodir") && chdir(class->dir) < 0) {
+		if (strncasecmp(class->dir, "http://", 7) && strcasecmp(class->dir, "nodir") && chdir(class->dir) < 0) {
 			ast_log(LOG_WARNING, "chdir() failed: %s\n", strerror(errno));
 			_exit(1);
 		}