Move away from the deprecated API and return the shiny new ERRPTR where
useful.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20200326211013.13531-2-wsa+renesas@sang-engineering.comSigned-off-by: Takashi Iwai <tiwai@suse.de>