Core: Simplify Memory::GetString

Source/Core/Core/HW/Memmap.h

@@ -118,7 +118,7 @@ void Write_U64_Swap(const u64 _Data, const u32 _Address);
 // Useful helper functions, used by ARM JIT
 void Write_F64(const double _Data, const u32 _Address);
 
-void GetString(std::string& _string, const u32 _Address);
+std::string GetString(u32 em_address);
 
 void WriteBigEData(const u8 *_pData, const u32 _Address, const size_t size);
 void ReadBigEData(u8 *_pDest, const u32 _Address, const u32 size);