Re: [PATCH] HID: playstation: DS4: Add BT poll interval adjustment

[Vadym Tytan <titanv3585@gmail.com>]

> kernel test robot noticed the following build warnings:
>
> sparse warnings: (new ones prefixed by >>)
>>> drivers/hid/hid-playstation.c:1773:25: sparse: sparse: symbol 'dev_attr_dualshock4_bt_poll_interval' was not declared. Should it be static?
> 
> vim +/dev_attr_dualshock4_bt_poll_interval +1773 drivers/hid/hid-playstation.c
> 
>    1772	
>> 1773	struct device_attribute dev_attr_dualshock4_bt_poll_interval = {
>    1774		.attr	= { .name = "bt_poll_interval", .mode = 0644 },
>    1775		.show	= dualshock4_show_poll_interval,
>    1776		.store	= dualshock4_store_poll_interval,
>    1777	};
>    1778	

This piece of code is expanded `DEVICE_ATTR` macro with changed variable 
name.
`DEVICE_ATTR` is defined as:
```c
// Reference: 
https://github.com/intel-lab-lkp/linux/blob/Vadym-Tytan/HID-playstation-DS4-Add-BT-poll-interval-adjustment/20250509-054413/include/linux/device.h#L138-L158
#define DEVICE_ATTR(_name, _mode, _show, _store) \
	struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, 
_store)
```
It doesn't use `static` so neither did I.

P.S. Macro was expanded and variable name was changed from 
`dev_attr_bt_poll_interval` to `dev_attr_dualshock4_bt_poll_interval` 
because this attribute only applies to DualShock4