RDMA/mlx5: Remove kernel-doc warning in umr.c

Remove extra asterisk to avoid the following kernel-doc warning:

  Warning: drivers/infiniband/hw/mlx5/umr.c:986 This comment starts with '/**',
  but isn't a kernel-doc comment. Refer to Documentation/doc-guide/kernel-doc.rst

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

drivers/infiniband/hw/mlx5/umr.c

diff --git a/drivers/infiniband/hw/mlx5/umr.c b/drivers/infiniband/hw/mlx5/umr.c
index 48cae5c..c595b85 100644
--- a/drivers/infiniband/hw/mlx5/umr.c
+++ b/drivers/infiniband/hw/mlx5/umr.c
@@ -978,7 +978,7 @@ static inline int _mlx5r_dmabuf_umr_update_pas(struct mlx5_ib_mr *mr,
 						     start_block, nblocks);
 }
 
-/**
+/*
  * This function makes an mkey non-present by zapping the translation entries of
  * the mkey by zapping (zeroing out) the first N entries, where N is determined
  * by the largest page size supported by the device and the MR length.