Fixed cut-n-paste regression using the wrong variable.

Fixes the missing DAHDI channels when using the newer chan_dahdi.conf
sections for channel configuration.

(closes issue ASTERISK-18496)
Reported by: Sean Darcy
Patches:
      jira_asterisk_18496_v1.8.patch (license #5621) patch uploaded by rmudgett
Tested by: Sean Darcy, rmudgett


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@335851 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -18023,7 +18023,7 @@ static int setup_dahdi_int(int reload, struct dahdi_chan_conf *default_conf, str
 			continue;
 		}
 
-		chans = ast_variable_retrieve(ucfg, cat, "dahdichan");
+		chans = ast_variable_retrieve(cfg, cat, "dahdichan");
 		if (ast_strlen_zero(chans)) {
 			/* Section is useless without a dahdichan value present. */
 			continue;