IB/rdmavt: Delete unused routine

This routine was obsoleted by the patch below.

Delete it.

Fixes: a2a074ef ("RDMA: Handle ucontext allocations by IB/core")
Link: https://lore.kernel.org/r/20200316210454.7753.94689.stgit@awfm-01.aw.intel.comReviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/sw/rdmavt/vt.c

@@ -284,12 +284,6 @@ static int rvt_query_gid(struct ib_device *ibdev, u8 port_num,
 					 &gid->global.interface_id);
 }
 
-static inline struct rvt_ucontext *to_iucontext(struct ib_ucontext
-						*ibucontext)
-{
-	return container_of(ibucontext, struct rvt_ucontext, ibucontext);
-}
-
 /**
  * rvt_alloc_ucontext - Allocate a user context
  * @uctx: Verbs context