get rid of alloc_pipe_info() argument

not used anymore

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index ed8eeeb..765114f 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -146,7 +146,7 @@
 /* Drop the inode semaphore and wait for a pipe event, atomically */
 void pipe_wait(struct pipe_inode_info *pipe);
 
-struct pipe_inode_info * alloc_pipe_info(struct inode * inode);
+struct pipe_inode_info *alloc_pipe_info(void);
 void free_pipe_info(struct inode * inode);
 void __free_pipe_info(struct pipe_inode_info *);