Silent a warning from coverity about icmap_track being used without assign

Signed-off-by: Steven Dake <sdake@redhat.com>
Reviewed-by: Angus Salkeld <asalked@redhat.com>

exec/mainconfig.c

@@ -511,7 +511,7 @@ static void main_logging_notify(
 
 static void add_logsys_config_notification(void)
 {
-	icmap_track_t icmap_track;
+	icmap_track_t icmap_track = NULL;
 
 	icmap_track_add("logging.",
 			ICMAP_TRACK_ADD | ICMAP_TRACK_DELETE | ICMAP_TRACK_MODIFY | ICMAP_TRACK_PREFIX,