(closes issue #10419)

Reported by: mustardman
Patches:
      asterisk-mohposition.diff.txt uploaded by jamesgolovich (license 176)

This patch fixes a few problems with music on hold.
 * Fix issues with starting at the beginning of a file when it shouldn't.
 * Fix the inuse counter to be decremented even if the class had not been
   set to be deleted when not in use anymore
 * Don't arbitrarily limit the number of MOH files to 255


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@81042 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_musiconhold.c

@@ -118,8 +118,8 @@ struct moh_files_state {
 	int origwfmt;
 	int samples;
 	int sample_queue;
-	unsigned char pos;
-	unsigned char save_pos;
+	int pos;
+	int save_pos;
 };
 
 #define MOH_QUIET		(1 << 0)
@@ -215,7 +215,7 @@ static void moh_files_release(struct ast_channel *chan, void *data)
 		}
 		state->save_pos = state->pos;
 	}
-	if (state->class->delete && ast_atomic_dec_and_test(&state->class->inuse))
+	if (ast_atomic_dec_and_test(&state->class->inuse) && state->class->delete)
 		ast_moh_destroy_one(state->class);
 }
 
@@ -232,9 +232,9 @@ static int ast_moh_files_next(struct ast_channel *chan)
 	}
 
 	/* If a specific file has been saved, use it */
-	if (state->save_pos) {
+	if (state->save_pos >= 0) {
 		state->pos = state->save_pos;
-		state->save_pos = 0;
+		state->save_pos = -1;
 	} else if (ast_test_flag(state->class, MOH_RANDOMIZE)) {
 		/* Get a random file and ensure we can open it */
 		for (tries = 0; tries < 20; tries++) {