Input: gpio-keys - avoid clearing twice some memory

bitmap_parselist() already clears the 'bits' bitmap, so there is no need
to clear it when it is allocated. This just wastes some cycles.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/d6ee621b9dd75b92f8831db365cee58dc2025322.1640813136.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>