xprtrdma: Remove request_module from backchannel

Since commit ffe1f0df ("rpcrdma: Merge svcrdma and xprtrdma
modules into one"), the forward and backchannel components are part
of the same kernel module. A separate request_module() call in the
backchannel code is no longer necessary.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/xprtrdma/backchannel.c

@@ -5,7 +5,6 @@
  * Support for backward direction RPCs on RPC/RDMA.
  */
 
-#include <linux/module.h>
 #include <linux/sunrpc/xprt.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/sunrpc/svc_xprt.h>
@@ -101,7 +100,6 @@ int xprt_rdma_bc_setup(struct rpc_xprt *xprt, unsigned int reqs)
 		goto out_free;
 
 	r_xprt->rx_buf.rb_bc_srv_max_requests = reqs;
-	request_module("svcrdma");
 	trace_xprtrdma_cb_setup(r_xprt, reqs);
 	return 0;