HID: playstation: Prefer kzalloc(sizeof(*buf)...)

HID: playstation: Prefer kzalloc(sizeof(*buf)...)

Use the shorter variant as suggested by checkpatch.pl:

  CHECK: Prefer kzalloc(sizeof(*buf)...) over kzalloc(sizeof(struct dualsense_output_report_bt)...)

This also improves further maintainability.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: Benjamin Tissoires <bentiss@kernel.org>
Tested-by: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>