SUNRPC: Remove stale comments

bc_close() and bc_destroy now do something, so the comments are
no longer correct. Commit 6221f1d9 ("SUNRPC: Fix backchannel
RPC soft lockups") should have removed these.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/xprtsock.c

@@ -2987,20 +2987,11 @@ static int bc_send_request(struct rpc_rqst *req)
 	return len;
 }
 
-/*
- * The close routine. Since this is client initiated, we do nothing
- */
-
 static void bc_close(struct rpc_xprt *xprt)
 {
 	xprt_disconnect_done(xprt);
 }
 
-/*
- * The xprt destroy routine. Again, because this connection is client
- * initiated, we do nothing
- */
-
 static void bc_destroy(struct rpc_xprt *xprt)
 {
 	dprintk("RPC:       bc_destroy xprt %p\n", xprt);