[PATCH 0/1] MR2699: evr: Don't flip image vertically.

[eric pouech (＠epo)]

This is actually fixing two issues:
- if we get a negative stride, then the video transform should have
  already flipped vertically the image, so we don't need to flip it
  again.
  (This is another side effect for handling negative strides in
  wg_transform).
- it also fixes a crash in AoEII, as the image source line offsets
  were incorrectly computed with unsigned arithmetic (while signed
  arithmetic was expected), resulting in incorrect sign propagation
  from 32bit to 64bit integers.

Signed-off-by: Eric Pouech