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Handle __copy_from_user() return value. Noticed by inspection, not from build warning. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>