[PATCH wireless] wifi: mt76: mt7921: check drv_pmctrl return in the PCIe reset path

[moosager]

Hello,

I can confirm the patch works as advertised:

> With the return checked, 26 ownership failures produced no firmware
> download, and mt7921_mac_reset_work() got as far as logging "chip reset
> failed", which it never did otherwise.

I would like to reiterate, though, that a more complete fix should be pursued by 
anyone who has more knowledge of the driver or firmware. Previously, a marginal 
improvement like this one was applied, but the issue persists to this day 
(see [1]).

Thanks in advance.

[1] https://patchwork.kernel.org/project/linux-wireless/patch/727eb5ffd3c7c805245e512da150ecf0a7154020.1659452909.git.deren.wu@mediatek.com/