page-xfer: Argument cannot be negative (NEGATIVE_RETURNS)

CID 73358 (#2 of 2): Argument cannot be negative (NEGATIVE_RETURNS)
 sk is passed to a parameter that cannot be negative.

Signed-off-by: Adrian Reber <areber@redhat.com>

criu/page-xfer.c

@@ -1457,7 +1457,7 @@ int cr_page_server(bool daemon_mode, bool lazy_dump, int cfd)
 		return ret > 0 ? 0 : -1;
 
 	if (tls_x509_init(ask, true)) {
-		close(sk);
+		close_safe(&sk);
 		return -1;
 	}