GameCube SRAM: Recalculate checksums after setting language.

This fixes a minor bug where the IPL thinks the SRAM has been corrupted and forces you to re-set date/time and settings when you change language in Config -> GameCube while not skipping the IPL on boot.

Source/Core/Core/HW/EXI_DeviceIPL.cpp

@@ -116,6 +116,7 @@ CEXIIPL::CEXIIPL() :
 
 	// We Overwrite language selection here since it's possible on the GC to change the language as you please
 	g_SRAM.lang = SConfig::GetInstance().m_LocalCoreStartupParameter.SelectedLanguage;
+	FixSRAMChecksums();
 
 	WriteProtectMemory(m_pIPL, ROM_SIZE);
 	m_uAddress = 0;

Source/Core/Core/HW/Sram.cpp

@@ -89,3 +89,16 @@ void SetCardFlashID(u8* buffer, u8 card_index)
 	g_SRAM.flashID_chksum[card_index] = csum^0xFF;
 }
 
+void FixSRAMChecksums()
+{
+	u16 checksum = 0;
+	u16 checksum_inv = 0;
+	for (int i = 0x0C; i < 0x14; i += 2)
+	{
+		int value = (g_SRAM.p_SRAM[i] << 8) + g_SRAM.p_SRAM[i+1];
+		checksum += value;
+		checksum_inv += value ^ 0xFFFF;
+	}
+	g_SRAM.checksum = Common::swap16(checksum);
+	g_SRAM.checksum_inv = Common::swap16(checksum_inv);
+}

Source/Core/Core/HW/Sram.h

@@ -66,6 +66,7 @@ union SRAM
 #pragma pack(pop)
 void InitSRAM();
 void SetCardFlashID(u8* buffer, u8 card_index);
+void FixSRAMChecksums();
 
 extern SRAM sram_dump;
 extern SRAM g_SRAM;