HID: hid-sensor-hub: move to devm_kzalloc

devm_kzalloc() will manage resources freeing and allows to make error path
smaller and nicer.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>