net: fix new sunrpc kernel-doc warning

Fix new kernel-doc warning in sunrpc:

Warning(net/sunrpc/xprt.c:196): No description found for parameter 'xprt'

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 9b6a4d1..f4385e4 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -187,6 +187,7 @@
 /**
  * xprt_reserve_xprt - serialize write access to transports
  * @task: task that is requesting access to the transport
+ * @xprt: pointer to the target transport
  *
  * This prevents mixing the payload of separate requests, and prevents
  * transport connects from colliding with writes.  No congestion control