UCT/CUDA: minor fix

Author: shasson5

src/uct/cuda/base/cuda_iface.c

@@ -190,8 +190,9 @@ static void uct_cuda_base_stream_flushed_cb(uct_completion_t *self)
 ucs_status_t
 uct_cuda_base_ep_flush(uct_ep_h tl_ep, unsigned flags, uct_completion_t *comp)
 {
-    uct_base_ep_t *ep       = ucs_derived_of(tl_ep, uct_base_ep_t);
-    uct_cuda_iface_t *iface = ucs_derived_of(tl_ep->iface, uct_cuda_iface_t);
+    uct_base_ep_t UCS_V_UNUSED *ep = ucs_derived_of(tl_ep, uct_base_ep_t);
+    uct_cuda_iface_t *iface        = ucs_derived_of(tl_ep->iface,
+                                                    uct_cuda_iface_t);
     uct_cuda_flush_desc_t *flush_desc;
     uct_cuda_flush_stream_desc_t *flush_stream_desc;
     uct_cuda_queue_desc_t *q_desc;