Fixes an issue with MOH where it doesn't recover cleanly when it can't play a file and would just stop, instead of continuing to find the next playable file in the MOH class.

(closes issue #17807)
Reported by: kshumard

Review: https://reviewboard.asterisk.org/r/910/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@285638 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_musiconhold.c

@@ -250,10 +250,17 @@ static int ast_moh_files_next(struct ast_channel *chan)
 		state->samples = 0;
 	}
 
-	if (!ast_openstream_full(chan, state->class->filearray[state->pos], chan->language, 1)) {
+	for (tries = 0; tries < state->class->total_files; ++tries) {
+		if (ast_openstream_full(chan, state->class->filearray[state->pos], chan->language, 1)) {
+			break;
+		}
+
 		ast_log(LOG_WARNING, "Unable to open file '%s': %s\n", state->class->filearray[state->pos], strerror(errno));
 		state->pos++;
 		state->pos %= state->class->total_files;
+	}
+
+	if (tries == state->class->total_files) {
 		return -1;
 	}