These readlocks always fail for me on my mac, and I saw it happen again

today on another mac.  We ignore the return value of locking operations almost
everywhere in Asterisk.  So, ignore these, as well, so Asterisk will actually
work on systems where this is occurring while I look into what the issue is.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@100514 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -207,10 +207,7 @@ static char *handle_cli_core_show_channeltypes(struct ast_cli_entry *e, int cmd,
 	ast_cli(a->fd, FORMAT, "Type", "Description",       "Devicestate", "Indications", "Transfer");
 	ast_cli(a->fd, FORMAT, "----------", "-----------", "-----------", "-----------", "--------");
 
-	if (AST_RWLIST_RDLOCK(&channels)) {
-		ast_log(LOG_WARNING, "Unable to lock channel list\n");
-		return CLI_FAILURE;
-	}
+	AST_RWLIST_RDLOCK(&channels);
 
 	AST_LIST_TRAVERSE(&backends, cl, list) {
 		ast_cli(a->fd, FORMAT, cl->tech->type, cl->tech->description,
@@ -270,10 +267,7 @@ static char *handle_cli_core_show_channeltype(struct ast_cli_entry *e, int cmd,
 	if (a->argc != 4)
 		return CLI_SHOWUSAGE;
 	
-	if (AST_RWLIST_RDLOCK(&channels)) {
-		ast_log(LOG_WARNING, "Unable to lock channel list\n");
-		return CLI_FAILURE;
-	}
+	AST_RWLIST_RDLOCK(&channels);
 
 	AST_LIST_TRAVERSE(&backends, cl, list) {
 		if (!strncasecmp(cl->tech->type, a->argv[3], strlen(cl->tech->type)))
@@ -468,10 +462,7 @@ const struct ast_channel_tech *ast_get_channel_tech(const char *name)
 	struct chanlist *chanls;
 	const struct ast_channel_tech *ret = NULL;
 
-	if (AST_RWLIST_RDLOCK(&channels)) {
-		ast_log(LOG_WARNING, "Unable to lock channel tech list\n");
-		return NULL;
-	}
+	AST_RWLIST_RDLOCK(&channels);
 
 	AST_LIST_TRAVERSE(&backends, chanls, list) {
 		if (!strcasecmp(name, chanls->tech->type)) {