stagefright amrnb: Properly negate all values

Initially, input values -32768 weren't negated properly.

This was committed on the master branch of the opencore
repository in commit f532d145194e474cb30d8644b8eee83873ad24cc,
based on AOSP contribution 10906.

Change-Id: I903353c5539a8fe94b7fc5f26b95eaeac57df5f4
1 file changed
tree: ceb42f74131ea950c1516c45b5b7c3ddcde66dc9
  1. camera/
  2. cmds/
  3. drm/
  4. include/
  5. media/
  6. services/