Use simple_read_from_buffer.  This also eliminates page allocation for the
sprintf buffer.  Switch to get_zeroed_page instead of open-coding it.  Viro
had ack'd this earlier.  Still applies w/ the transaction update.
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Stephen Smalley <sds@epoch.ncsc.mil>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>