svcrdma: Allocate recv_ctxt's on CPU handling Receives

Hello Chuck Lever,

The patch 0b2613c5883f: "svcrdma: Allocate recv_ctxt's on CPU handling Receives" from May 7, 2018, leads to the following static checker warning:

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c:273 svc_rdma_post_recvs()
warn: signedness bug returning '(-12)'

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
258 /**

   259   * svc_rdma_post_recvs - Post initial set of Recv WRs
   260   * @rdma: fresh svcxprt_rdma
   261   *
   262   * Returns true if successful, otherwise false.
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   263   */
   264  bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma)
   265  {
   266          struct svc_rdma_recv_ctxt *ctxt;
   267          unsigned int i;
   268          int ret;
   269  
   270          for (i = 0; i < rdma->sc_max_requests; i++) {
   271                  ctxt = svc_rdma_recv_ctxt_get(rdma);
   272                  if (!ctxt)
   273                          return -ENOMEM;
                                ^^^^^^^^^^^^^^^
   274                  ctxt->rc_temp = true;
   275                  ret = __svc_rdma_post_recv(rdma, ctxt);
   276                  if (ret) {

277 pr_err("svcrdma: failure posting recv buffers: %d\n",
278 ret);
279 return false;
280 }
281 }
282 return true;
283 }

regards,
dan carpenter