[PATCH v2 5/6] firmware: samsung: acpm: Fix out-of-bounds read and infinite loop in RX path

[Tudor Ambarus]

FYI, I checked sashiko's review on the set, and I shall act on this patch
and extend the checks for tx_front >= achan->qlen and add zero length checks
for qlen and mlen that were read from SRAM. I'll do that in v3.

The rest of the review feedback doesn't apply, so together with the changes
proposed in patch 4/6 that will be all.

Cheers,
ta