mei: fix kernel-doc warnings

Add missed parameters descriptions and return values descriptions

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index da476e8..49a2653 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -176,6 +176,8 @@
  * @cl: client
  * @hbm_cmd: host bus message command
  * @len: buffer length
+ *
+ * Return: 0 on success, <0 on failure.
  */
 static inline
 int mei_hbm_cl_write(struct mei_device *dev,