glsl: stop processing function parameters if error happened
Fixes: d1fa69ed ("glsl: do not attempt assignment if operand type not parsed correctly") Closes: mesa/mesa#2696 Signed-off-by:Tapani Pälli <tapani.palli@intel.com> Reviewed-by:
Timothy Arceri <tarceri@itsqueeze.com> Part-of: <mesa/mesa!4341>