bnxt_en: Fix reporting of test result in ethtool selftest

When the selftest command fails, driver is not reporting the failure
by updating the "test->flags" when bnxt_close_nic() fails.

Fixes: eb513658 ("bnxt_en: Add basic ethtool -t selftest support.")
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -3738,6 +3738,7 @@ static void bnxt_self_test(struct net_device *dev, struct ethtool_test *etest,
 		bnxt_ulp_stop(bp);
 		rc = bnxt_close_nic(bp, true, false);
 		if (rc) {
+			etest->flags |= ETH_TEST_FL_FAILED;
 			bnxt_ulp_start(bp, rc);
 			return;
 		}