reiserfs: use non-racy method for proc entries creation

reiserfs: use non-racy method for proc entries creation

Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data
be setup before gluing PDE to main tree.

/proc entry owner is also added.

Signed-off-by: Denis V. Lunev <[email protected]>
Cc: Jeff Mahoney <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>