media: ite-cir: IR receiver stop working after receive overflow

media: ite-cir: IR receiver stop working after receive overflow

Origin: https://git.linuxtv.org/media_stage.git/commit/?id=fdc881783099c6343921ff017450831c8766d12a
Bug-Debian: https://bugs.debian.org/996672

On an Intel NUC6iSYK, no IR is reported after a receive overflow.

When a receiver overflow occurs, this condition is only cleared by
reading the fifo. Make sure we read anything in the fifo.

Fixes: 28c7afb07ccf ("media: ite-cir: check for receive overflow")
Suggested-by: Bryan Pass <bryan.pass@gmail.com>
Tested-by: Bryan Pass <bryan.pass@gmail.com>
Cc: stable@vger.kernel.org>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name media-ite-cir-IR-receiver-stop-working-after-receive.patch