[PATCH for-next] IB/hfi1: Fix a build warning for TID RDMA READ

[Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>]

From: Kaike Wan <kaike.wan@xxxxxxxxx>

The following build warning was produced for the TID RDMA READ
patch ("IB/hfi1: Enable TID RDMA READ protocol"):

drivers/infiniband/hw/hfi1/qp.c: In function 'hfi1_setup_wqe':
drivers/infiniband/hw/hfi1/qp.c:328:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   hfi1_setup_tid_rdma_wqe(qp, wqe);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/infiniband/hw/hfi1/qp.c:329:2: note: here
  case IB_QPT_UC:
  ^~~~

This patch will fix the issue by adding the "fall through" comment.

Fixes: f1ab4efa6d32 ("IB/hfi1: Enable TID RDMA READ protocol")
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
Signed-off-by: Kaike Wan <kaike.wan@xxxxxxxxx>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
---
 drivers/infiniband/hw/hfi1/qp.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/qp.c b/drivers/infiniband/hw/hfi1/qp.c
index d8f7add..9b643c2 100644
--- a/drivers/infiniband/hw/hfi1/qp.c
+++ b/drivers/infiniband/hw/hfi1/qp.c
@@ -326,6 +326,7 @@ int hfi1_setup_wqe(struct rvt_qp *qp, struct rvt_swqe *wqe, bool *call_send)
 	switch (qp->ibqp.qp_type) {
 	case IB_QPT_RC:
 		hfi1_setup_tid_rdma_wqe(qp, wqe);
+		/* fall through */
 	case IB_QPT_UC:
 		if (wqe->length > 0x80000000U)
 			return -EINVAL;