NFSv4.1: Fix a request leak on the back channel

If the call to svc_process_common() fails, then the request
needs to be freed before we can exit bc_svc_process.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 017c011..074df5a 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -1377,7 +1377,8 @@
 						sizeof(req->rq_snd_buf));
 		return bc_send(req);
 	} else {
-		/* Nothing to do to drop request */
+		/* drop request */
+		xprt_free_bc_request(req);
 		return 0;
 	}
 }