ensure channelcount is cleared before we enumerate transcoders, so 'reload' doesn't double the channel count

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@53658 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/codec_zap.c

@@ -856,6 +856,11 @@ static int find_transcoders(void)
 		ast_log(LOG_NOTICE, "No Zaptel transcoder support!\n");
 		return 0;
 	}
+
+	ast_mutex_lock(&channelcount);
+	totalchannels = 0;
+	ast_mutex_unlock(&channelcount);
+
 	for (info.tcnum = 0; !(res = ioctl(fd, ZT_TRANSCODE_OP, &info)); info.tcnum++) {
 		if (option_verbose > 1)
 			ast_verbose(VERBOSE_PREFIX_2 "Found transcoder '%s'.\n", info.name);