RDMA/sw/rdmavt/mad: Fix 'rvt_process_mad()'s documentation header

Fixes the following W=1 kernel build warning(s):

 drivers/infiniband/sw/rdmavt/mad.c:75: warning: Function parameter or member 'in' not described in 'rvt_process_mad'
 drivers/infiniband/sw/rdmavt/mad.c:75: warning: Function parameter or member 'in_mad_size' not described in 'rvt_process_mad'
 drivers/infiniband/sw/rdmavt/mad.c:75: warning: Function parameter or member 'out' not described in 'rvt_process_mad'
 drivers/infiniband/sw/rdmavt/mad.c:75: warning: Function parameter or member 'out_mad_size' not described in 'rvt_process_mad'
 drivers/infiniband/sw/rdmavt/mad.c:75: warning: Function parameter or member 'out_mad_pkey_index' not described in 'rvt_process_mad'
 drivers/infiniband/sw/rdmavt/mad.c:75: warning: Excess function parameter 'in_mad' description in 'rvt_process_mad'
 drivers/infiniband/sw/rdmavt/mad.c:75: warning: Excess function parameter 'out_mad' description in 'rvt_process_mad'

Link: https://lore.kernel.org/r/20210121094519.2044049-21-lee.jones@linaro.org
Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rdmavt/mad.c

@@ -56,8 +56,11 @@
  * @port_num: the port number this packet came in on, 1 based from ib core
  * @in_wc: the work completion entry for this packet
  * @in_grh: the global route header for this packet
- * @in_mad: the incoming MAD
- * @out_mad: any outgoing MAD reply
+ * @in: the incoming MAD
+ * @out_mad_size: size of the incoming MAD reply
+ * @out: any outgoing MAD reply
+ * @out_mad_size: size of the outgoing MAD reply
+ * @out_mad_pkey_index: unused
  *
  * Note that the verbs framework has already done the MAD sanity checks,
  * and hop count/pointer updating for IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE