Fix WaitExten(x,m(musicclass)) string termination.

The AST_CONTROL_HOLD MOH class from the WaitExten application can now be
queued onto a channel, passed over local channels with the /m option, and
passed over IAX channels.
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Merged revisions 367469 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 367470 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@367477 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/pbx.c

@@ -9920,7 +9920,8 @@ static int pbx_builtin_waitexten(struct ast_channel *chan, const char *data)
 	if (ast_test_flag(&flags, WAITEXTEN_MOH) && !opts[0] ) {
 		ast_log(LOG_WARNING, "The 'm' option has been specified for WaitExten without a class.\n");
 	} else if (ast_test_flag(&flags, WAITEXTEN_MOH)) {
-		ast_indicate_data(chan, AST_CONTROL_HOLD, S_OR(opts[0], NULL), strlen(opts[0]));
+		ast_indicate_data(chan, AST_CONTROL_HOLD, S_OR(opts[0], NULL),
+			!ast_strlen_zero(opts[0]) ? strlen(opts[0]) + 1 : 0);
 	} else if (ast_test_flag(&flags, WAITEXTEN_DIALTONE)) {
 		struct ast_tone_zone_sound *ts = ast_get_indication_tone(ast_channel_zone(chan), "dial");
 		if (ts) {