Please apply 7d18f0a14aa6a ("gpio: No Null owner") to 4.4.y, 4.9.y, 4.14.y

[Daniel Rosenberg <drosen@xxxxxxxxxx>]

7d18f0a14aa6a0d6bad39111c1fb655f07f71d59 ("gpio: No NULL owner") fixes 
an issue from 24e78079bf2250874e33da2e7cfbb6db72d3caf4 ("gpio: label 
descriptors using the device name") which has been included in stable 
branches. It handles the case where GPIOs are fetched with a NULL parent 
device.

The patch originally went in in 4.15, so more recent branches shouldn't 
have that issue.

-Daniel Rosenberg