SUNRPC: remove BUG_ON from bc_send

Replace BUG_ON() with WARN_ON_ONCE(). The error condition is a simple
ref counting sanity check and the following code will not free anything
until final put.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/bc_svc.c b/net/sunrpc/bc_svc.c
index 0b2eb38..15c7a8a 100644
--- a/net/sunrpc/bc_svc.c
+++ b/net/sunrpc/bc_svc.c
@@ -53,7 +53,7 @@
 	if (IS_ERR(task))
 		ret = PTR_ERR(task);
 	else {
-		BUG_ON(atomic_read(&task->tk_count) != 1);
+		WARN_ON_ONCE(atomic_read(&task->tk_count) != 1);
 		ret = task->tk_status;
 		rpc_put_task(task);
 	}