mlxsw: spectrum_acl_tcam: Add missing mutex_destroy()

Pair mutex_init() with a mutex_destroy() in the error path. Found during
code review. No functional changes.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c

@@ -52,8 +52,10 @@ int mlxsw_sp_acl_tcam_init(struct mlxsw_sp *mlxsw_sp,
 		max_regions = max_tcam_regions;
 
 	tcam->used_regions = bitmap_zalloc(max_regions, GFP_KERNEL);
-	if (!tcam->used_regions)
-		return -ENOMEM;
+	if (!tcam->used_regions) {
+		err = -ENOMEM;
+		goto err_alloc_used_regions;
+	}
 	tcam->max_regions = max_regions;
 
 	max_groups = MLXSW_CORE_RES_GET(mlxsw_sp->core, ACL_MAX_GROUPS);
@@ -76,6 +78,8 @@ int mlxsw_sp_acl_tcam_init(struct mlxsw_sp *mlxsw_sp,
 	bitmap_free(tcam->used_groups);
 err_alloc_used_groups:
 	bitmap_free(tcam->used_regions);
+err_alloc_used_regions:
+	mutex_destroy(&tcam->lock);
 	return err;
 }