wl_fixed_to_double() function only correct when fixed value is greater than zero

[程安絮]

In file main.go is my implementation of FixedToFloat64 vs wl_fixed_to_double, the comments can help you to understand my codes.
Since event wl_touch::orientation's orientation arg is fixed value and can be negative, I think this bug is not acceptable.
Besides, I don't understand how wl_fixed_to_double works, can anyone illustrate that for me? 

--------------------------------程安絮
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