svcrdma: Remove unused variable in rdma_copy_tail()

Clean up.

linux-2.6/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c: In function
 ‘rdma_copy_tail’:
linux-2.6/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c:376:6: warning:
 variable ‘ret’ set but not used [-Wunused-but-set-variable]
  int ret;
      ^

Fixes: a97c331f ("svcrdma: Handle additional inline content")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c

@@ -373,9 +373,7 @@ rdma_copy_tail(struct svc_rqst *rqstp, struct svc_rdma_op_ctxt *head,
 	       u32 position, u32 byte_count, u32 page_offset, int page_no)
 {
 	char *srcp, *destp;
-	int ret;
 
-	ret = 0;
 	srcp = head->arg.head[0].iov_base + position;
 	byte_count = head->arg.head[0].iov_len - position;
 	if (byte_count > PAGE_SIZE) {