amrnb: Restart the p_xn pointer when retraversing the array on overflow

This is a safeguard to avoid issues in a rare codepath.

This was committed on the master branch of the opencore
repository in commit f532d145194e474cb30d8644b8eee83873ad24cc,
based on AOSP contribution 10905.

Change-Id: I9688b009bcbe63d88ee5040e883a021aefa30664
1 file changed