Apply d853b3406903a7dc5b14eb5bada3e8cd677f66a2 to 5.4 and 5.9

[Nathan Chancellor <natechancellor@xxxxxxxxx>]

Hi Greg and Sasha,

Please apply commit d853b3406903 ("spi: bcm2835aux: Restore err
assignment in bcm2835aux_spi_probe") to linux-5.4.y and linux-5.9.y as a
fix for commit e13ee6cc4781 ("spi: bcm2835aux: Fix use-after-free on
unbind"). I did not realize that commit was tagged for stable so I did
not tag my fix accordingly, sorry for not noticing sooner.

Cheers,
Nathan