Fix checkpatch warning:
WARNING: kfree(NULL) is safe this check is probably not required
Cc: Ivo van Doorn <IvDoorn@gmail.com> Cc: Helmut Schaa <helmut.schaa@googlemail.com> Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: John W. Linville <linville@tuxdriver.com>