Input: walkera0701 - clear unused function pointers
Input: walkera0701 - clear unused function pointers

walkera0701_parport_cb is a local uninitialized structure and the member
function pointers will be pointing to arbitrary locations unless they
are cleared.

Fixes: 221bcb24c653 ("Input: walkera0701 - use parallel port device model")
Signed-off-by: Sudip Mukherjee <8ebcb270388efeefbc3b674e2d51f150dd6e6b25@vectorindia.org>
Signed-off-by: Dmitry Torokhov <6b8646d310837fed93a129ed3c979b90c7f2674f@gmail.com>
KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs