USB: usbfs: fix potential infoleak in devio

The stack object "ci" has a total size of 8 bytes. Its last 3 bytes
are padding bytes which are not initialized and leaked to userland
via "copy_to_user".

Change-Id: Iedd743ab04eb30b6133fc45bb549fcbae60c12fa
Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 681fef8380eb818c0b845fca5d2ab1dcbab114ee
Git-repo: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git


Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>