get rid of the last free_pipe_info() callers

and rename __free_pipe_info() to free_pipe_info()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/exit.c b/kernel/exit.c
index 51e485c..cd9e9e7 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -847,7 +847,7 @@
 		exit_io_context(tsk);
 
 	if (tsk->splice_pipe)
-		__free_pipe_info(tsk->splice_pipe);
+		free_pipe_info(tsk->splice_pipe);
 
 	if (tsk->task_frag.page)
 		put_page(tsk->task_frag.page);