Fix first frame error return

Remove the check that returns before joining the slave threads
if there is an error in the first frame. And in slice error mode
do not parse bitstream.

Bug: 64784973
Test: no longer hangs on POC
Change-Id: I3c2e2d9f84304bcb34831d7d796da710154774fa
(cherry picked from commit 8fff219facbecceee193e823d4faf7866524e92a)
2 files changed