removes spurious compilation warning

This commit was SVN r23441.

ompi/mca/btl/openib/btl_openib_endpoint.h

@@ -503,7 +503,8 @@ static inline int post_send(mca_btl_openib_endpoint_t *ep,
 #if OPAL_ENABLE_DEBUG
 	do {
 	  ftr->seq = ep->eager_rdma_remote.seq;
-	} while (!OPAL_ATOMIC_CMPSET_32(&ep->eager_rdma_remote.seq, ftr->seq, ftr->seq+1));
+	} while (!OPAL_ATOMIC_CMPSET_32((int32_t*)&ep->eager_rdma_remote.seq, 
+					(int32_t)ftr->seq, (int32_t)ftr->seq+1));
 #endif
         if(ep->nbo)
             BTL_OPENIB_FOOTER_HTON(*ftr);