- else if ((a = PySequence_GetItem(x, 0)) == 0 || convuint(a, &f->f) ||
- (b = PySequence_GetItem(x, 1)) == 0 || convuint(b, &f->m))
+ else if ((a = PySequence_GetItem(x, 0)) == 0 || !convuint(a, &f->f) ||
+ (b = PySequence_GetItem(x, 1)) == 0 || !convuint(b, &f->m))