staging/rdma/hfi1: Remove void function return statement

Remove return statement at the end of a void function to fix
checkpatch warning:
WARNING: void function return statements are not generally useful

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/staging/rdma/hfi1/uc.c

@@ -603,5 +603,4 @@ drop:
 
 op_err:
 	hfi1_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
-	return;
 }