Staging: ozwpan: Change kmalloc() to kzalloc()

changing to kzalloc lets us get rid of some lines. The other concern
here is that some members of binding->ptype are still uninitialized at
the end of the function.

Signed-off-by: Salym Senyonga <salymsash@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>