net/mlx5e: fix up for "net/mlx5e: Move MACsec flow steering operations to be used as core library"

Recent merge had a conflict in:

drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec_fs.c

between commit:

aeb660171b06 ("net/mlx5e: fix double free in macsec_fs_tx_create_crypto_table_groups")

from Linus' tree and commit:

cb5ebe4896f9 ("net/mlx5e: Move MACsec flow steering operations to be used as core library")

from the mlx5-next tree. This was missed and the former commit
got lost, bring it back.

Fixes: 3c5066c6b0a5 ("Merge branch 'mlx5-next' of https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux")
Signed-off-by: Stephen Rothwell <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/mellanox/mlx5/core/lib/macsec_fs.c

···
 
 	if (!in) {
 		kfree(ft->g);
+		ft->g = NULL;
 		return -ENOMEM;
 	}