HID: corsair-void: Initialise memory for psy_cfg

power_supply_config psy_cfg was missing its initialiser, add it in.

Fixes: 6ea2a6fd ("HID: corsair-void: Add Corsair Void headset family driver")
Cc: stable@vger.kernel.org
Signed-off-by: Stuart Hayhurst <stuart.a.hayhurst@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>