va_trace: remove unused variables
va_trace: remove unused variables

Remove unused variables detected by clang-3.8

Fixes #89

Signed-off-by: Víctor Manuel Jáquez Leal <853e0dbb5ddd43a0f0483f24794ae05c4c52af91@igalia.com>

01org/libva-cros,01org/libva-cros,01org/libva-cros