app_queue: fix Calculate talktime when is first call answered

Fix calculate of average time for talktime is wrong when is completed the
first call beacuse the time for talked would be that call.

ASTERISK-25800 #close

Change-Id: I94f79028935913cd9174b090b52bb300b91b9492

apps/app_queue.c

@@ -5441,9 +5441,13 @@ static int update_queue(struct call_queue *q, struct member *member, int callcom
 	if (callcompletedinsl) {
 		q->callscompletedinsl++;
 	}
-	/* Calculate talktime using the same exponential average as holdtime code*/
-	oldtalktime = q->talktime;
-	q->talktime = (((oldtalktime << 2) - oldtalktime) + newtalktime) >> 2;
+	if (q->callscompletedinsl == 1) {
+		q->talktime = newtalktime;
+	} else {
+		/* Calculate talktime using the same exponential average as holdtime code */
+		oldtalktime = q->talktime;
+		q->talktime = (((oldtalktime << 2) - oldtalktime) + newtalktime) >> 2;
+	}
 	ao2_unlock(q);
 	return 0;
 }