../src/sna/sna_composite.c:567:11: warning: variable ‘sx’ might be clobbered by ‘longjmp’ or ‘vfork’ [-Wclobbered]
   int16_t sx = src_x + tx - (dst->pDrawable->x + dst_x);
           ^~
etc.

I had a quick look at a few of the cases and they seemed fine to me,
so feels like gcc just being dense.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>