net/mlx5: HWS, Fix an error code in mlx5hws_bwc_rule_create_complex()

This was intended to be negative -ENOMEM but the '-' character was left
off accidentally.  This typo doesn't affect runtime because the caller
treats all non-zero returns the same.

Fixes: 17e0acc ("net/mlx5: HWS, support complex matchers")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/aDCbjNcquNC68Hyj@stanley.mountain
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Dan Carpenter

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc_complex.c

@@ -1188,7 +1188,7 @@ int mlx5hws_bwc_rule_create_complex(struct mlx5hws_bwc_rule *bwc_rule,
 			      GFP_KERNEL);
 	if (unlikely(!match_buf_2)) {
 		mlx5hws_err(ctx, "Complex rule: failed allocating match_buf\n");
-		ret = ENOMEM;
+		ret = -ENOMEM;
 		goto hash_node_put;
 	}