net/mlx5: DR, Fix matcher builders select check

When selecting a matcher ste_builder_arr will always be evaluated
as true, instead check if num_of_builders is set for validity.

Fixes: 667f2646 ("net/mlx5: DR, Support IPv4 and IPv6 mixed matcher")
Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_matcher.c

@@ -154,7 +154,7 @@ int mlx5dr_matcher_select_builders(struct mlx5dr_matcher *matcher,
 	nic_matcher->num_of_builders =
 		nic_matcher->num_of_builders_arr[outer_ipv][inner_ipv];
 
-	if (!nic_matcher->ste_builder) {
+	if (!nic_matcher->num_of_builders) {
 		mlx5dr_dbg(matcher->tbl->dmn,
 			   "Rule not supported on this matcher due to IP related fields\n");
 		return -EINVAL;