Revert "RDMA/mlx5: Fix integer overflow while resizing CQ"

The original commit of this patch has a munged log message that is
missing several of the tags the original author intended to be on the
patch.  This was due to patchworks misinterpreting a cut-n-paste
separator line as an end of message line and munging the mbox that was
used to import the patch:

https://patchwork.kernel.org/patch/10264089/

The original patch will be reapplied with a fixed commit message so the
proper tags are applied.

This reverts commit aa0de36a.
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/cq.c

@@ -1178,12 +1178,7 @@ static int resize_user(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
 	if (ucmd.reserved0 || ucmd.reserved1)
 		return -EINVAL;
 
-	/* check multiplication overflow */
-	if (ucmd.cqe_size && SIZE_MAX / ucmd.cqe_size <= entries - 1)
-		return -EINVAL;
-
-	umem = ib_umem_get(context, ucmd.buf_addr,
-			   (size_t)ucmd.cqe_size * entries,
+	umem = ib_umem_get(context, ucmd.buf_addr, entries * ucmd.cqe_size,
 			   IB_ACCESS_LOCAL_WRITE, 1);
 	if (IS_ERR(umem)) {
 		err = PTR_ERR(umem);