https://bugs.freedesktop.org/show_bug.cgi?id=98914
--- Comment #8 from Jörg-Volker Peetz jvpeetz@web.de --- Thanks for caring and your git lesson.
The culprit is the change in src/gallium/auxiliary/vl/vl_zscan.c . I double-checked by starting from mesa-13.0.2 and just reverted the type change in that file back to "signed i;" which is enough to repair this regression.