it looks like passing enums to va_start is unsafe as codechecker reports...

it looks like passing enums to va_start is unsafe as codechecker reports "passing an object that undergoes default argument promotion to 'va_start' has undefined behavior".
Maybe adding a casting to int (forcing the int conversion) will fix it.

Signed-off-by: Kristof Szabados <Kristof.Szabados@ericsson.com>