RDMA/uverbs: Initialize uverbs_attr_bundle ucontext in ib_uverbs_get_context

ib_uverbs_get_context does not have a uobject so it does not call the
rdma_lookup_get_uobject which is used to set up the uverbs_attr_bundle
ucontext. For ib_uverbs_get_context we need to set up this manually before
we send the uverbs_attr_bundle down to the driver layer.

This completes the change that was done in commit 70f06b26 ("IB:
ucontext should be set properly for all cmd & ioctl paths")
Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/uverbs_cmd.c

@@ -230,6 +230,8 @@ static int ib_uverbs_get_context(struct uverbs_attr_bundle *attrs)
 		goto err_alloc;
 	}
 
+	attrs->context = ucontext;
+
 	ucontext->res.type = RDMA_RESTRACK_CTX;
 	ucontext->device = ib_dev;
 	ucontext->cg_obj = cg_obj;