From: Neil Brown <neilb@cse.unsw.edu.au>

The recentish change to fh_compose not consuming a reference to the passed
dentries missed this needed dget.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>