GBA Savedata: Code cleanup
GBA Savedata: Code cleanup

Anty-Lemon/mgba,iracigt/mgba,fr500/mgba,libretro/mgba,sergiobenrocha2/mgba,libretro/mgba,sergiobenrocha2/mgba,Anty-Lemon/mgba,mgba-emu/mgba,Anty-Lemon/mgba,mgba-emu/mgba,Iniquitatis/mgba,Iniquitatis/mgba,iracigt/mgba,MerryMage/mgba,mgba-emu/mgba,sergiobenrocha2/mgba,libretro/mgba,MerryMage/mgba,jeremyherbert/mgba,iracigt/mgba,fr500/mgba,libretro/mgba,jeremyherbert/mgba,Iniquitatis/mgba,fr500/mgba,iracigt/mgba,Iniquitatis/mgba,libretro/mgba,fr500/mgba,mgba-emu/mgba,sergiobenrocha2/mgba,jeremyherbert/mgba,sergiobenrocha2/mgba,Anty-Lemon/mgba,MerryMage/mgba,jeremyherbert/mgba