fix remaining breakage from yesterday's changes

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6881 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_agent.c b/channels/chan_agent.c
index ef6b319..8859afc 100755 (executable)
--- a/channels/chan_agent.c
+++ b/channels/chan_agent.c
@@ -1822,7 +1822,7 @@ static int __login_exec(struct ast_channel *chan, void *data, int callbackmode)
                                                int pos = 0;
                                                /* Retrieve login chan */
                                                for (;;) {
-                                                       if (args.extension) {
+                                                       if (!ast_strlen_zero(args.extension)) {
                                                                ast_copy_string(tmpchan, args.extension, sizeof(tmpchan));
                                                                res = 0;
                                                        } else