pass the right variable to get an error string... oops

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@97448 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_zap.c

@@ -1429,12 +1429,12 @@ static void zt_enable_ec(struct zt_pvt *p)
 			x = 1;
 			res = ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &x);
 			if (res)
-				ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d (%s)\n", p->channel, strerror(res));
+				ast_log(LOG_WARNING, "Unable to enable audio mode on channel %d (%s)\n", p->channel, strerror(errno));
 		}
 		x = p->echocancel;
 		res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOCANCEL, &x);
 		if (res) 
-			ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d (%s)\n", p->channel, strerror(res));
+			ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d (%s)\n", p->channel, strerror(errno));
 		else {
 			p->echocanon = 1;
 			if (option_debug)