Boolean function not returning true or false explicitly.

[lioncash]

See: https://github.com/DHrpcs3/rpcs3/blob/master/rpcs3/Emu/Memory/Memory.h#L473

The unmap function doesn't return true or false by the time it hits the end of the function or anywhere in it (in an explicit sense). Technically the function will always return false.

[ghost]

Closing this since unknownbrackets made a pull request that addresses this issue.