mlx4_core: Remove kfree() in mlx4_mr_alloc() error flow

mlx4_mr_alloc() doesn't actually allocate mr (it just initializes the
pointer that the caller passes in), so it shouldn't free it if an
error occurs.
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/net/mlx4/mr.c

@@ -255,10 +255,8 @@ int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
 	int err;
 
 	index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
-	if (index == -1) {
-		err = -ENOMEM;
-		goto err;
-	}
+	if (index == -1)
+		return -ENOMEM;
 
 	mr->iova       = iova;
 	mr->size       = size;
@@ -269,15 +267,8 @@ int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
 
 	err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
 	if (err)
-		goto err_index;
-
-	return 0;
-
-err_index:
 		mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);
 
-err:
-	kfree(mr);
 	return err;
 }
 EXPORT_SYMBOL_GPL(mlx4_mr_alloc);