Fixed Coverity reports 1358014-1358018 (DEADCODE and CHECK_RETURN)

ompi/mca/pml/ob1/pml_ob1_recvreq.c

@@ -106,7 +106,7 @@ static int mca_pml_ob1_recv_request_cancel(struct ompi_request_t* ompi_request,
     /* The rest should be protected behind the match logic lock */
     OB1_MATCHING_LOCK(&ob1_comm->matching_lock);
     if( true == request->req_match_received ) { /* way to late to cancel this one */
-        OPAL_THREAD_UNLOCK(&ob1_comm->matching_lock);
+        OB1_MATCHING_LOCK(&ob1_comm->matching_lock);
         assert( OMPI_ANY_TAG != ompi_request->req_status.MPI_TAG ); /* not matched isn't it */
         return OMPI_SUCCESS;
     }

opal/mca/btl/tcp/btl_tcp.h

@@ -96,7 +96,7 @@ extern int mca_btl_tcp_progress_thread_trigger;
     do {                                                                \
         if(0 < mca_btl_tcp_progress_thread_trigger) {                   \
             opal_event_t* _event = (opal_event_t*)(event);                  \
-            opal_fd_write( mca_btl_tcp_pipe_to_progress[1], sizeof(opal_event_t*), \
+            (void) opal_fd_write( mca_btl_tcp_pipe_to_progress[1], sizeof(opal_event_t*), \
                            &_event);                                        \
         }                                                                   \
         else {                                                          \