There's a missing failure handling check here that would possibly lead to a
null dereference later on, I'm not sure about the correct return value
however.  I haven't tried it as I'm not sure how to trigger the case ;)

Found by the Coverity tool.
Signed-off-by: Alexander Nyberg <alexn@dsv.su.se>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>