Fix missing return statement in swizzle assignment operator
Fix missing return statement in swizzle assignment operator

nikodil/glm,dustin-biser/glm,nikodil/glm,rleigh-dundee/glm,novaquark/glm,rleigh-dundee/glm,ramassin/glm,hrehfeld/glm,ramassin/glm,dustin-biser/glm,hrehfeld/glm,novaquark/glm