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:

  aeb6601 ("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: 3c5066c ("Merge branch 'mlx5-next' of https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux")
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/r/20230815123725.4ef5b7b9@canb.auug.org.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: sfrothwell

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

@@ -278,6 +278,7 @@ static int macsec_fs_tx_create_crypto_table_groups(struct mlx5_macsec_flow_table
 
 	if (!in) {
 		kfree(ft->g);
+		ft->g = NULL;
 		return -ENOMEM;
 	}