kill struct opendata

Just pass struct file *.  Methods are happier that way...
There's no need to return struct file * from finish_open() now,
so let it return int.  Next: saner prototypes for parts in
namei.c

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/internal.h

@@ -82,9 +82,6 @@ extern struct super_block *user_get_super(dev_t);
 /*
  * open.c
  */
-struct opendata {
-	struct file *filp;
-};
 struct open_flags {
 	int open_flag;
 	umode_t mode;