Staging: ipack: return proper value in match() function

It should return the same value given by the match function of the ipack_driver
that has been called.

Returning 0 here, means that the match has failed and it could be succeed.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>