Fix bug caught by -Wparentheses (#915)
Fix bug caught by -Wparentheses (#915)

This fix is required to build with -Wall -Werror with GCC >= 5.

Signed-off-by: Einar Hov <b9006815c7432ac8d62af610cf0b15973d45ff47@arm.com>
KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS,KhronosGroup/OpenCL-CTS