CID 304936: Dereference before null check

controlconf.c

1191cleanup:
    	
CID 304936 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking listener suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
1192        if (listener != NULL) {
1193                isc_refcount_decrement(&listener->refs);
1194                listener->exiting = true;
1195                free_listener(listener);
1196        }