Fix CLANG-warning about unused member variable m_defaultAntialiasingMode.

Change-Id: I68a04532bacd326b4bb3eb8f9a7ee04c67fcd68e
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
Fix CLANG-warning  '&&' within '||' [-Wlogical-op-parentheses].

Change-Id: Id724c86f87a78048df9b93f2d190593d36261943
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>