glapi: fix typo in count_scale

 2*4=8

Signed-off-by: Gregory Hainaut <gregory.hainaut@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
(cherry picked from commit 2ab5eccf5de4a68d0d8d2668f6c5244cc6a41846)
1 file changed