Fix game freeze/crash issue by adding null pointer safety checks to CHR_DBG_FLAGSReal operations

[Copilot]

Problem

The Elden Menu mod was causing game freezes and crashes when users clicked on certain features like "FREEZE ENEMIES". This occurred when the signature scanning failed to find the correct memory patterns in newer versions of Elden Ring, resulting in null pointer dereferences.

Root Cause

The issue was in the memory address resolution process:

1. CHR_DBG_FLAGSAddr could return 0 when signature scanning fails
2. CHR_DBG_4bytesAddr would then become (int*)0x2, causing crashes when dereferenced
3. CHR_DBG_FLAGSReal could become 0 or invalid, but the code still attempted to write to memory offsets
4. Writing to invalid memory addresses (CHR_DBG_FLAGSReal + offset) caused game freezes and crashes

Solution

Added comprehensive null pointer safety checks throughout the codebase:

Early Validation

// Prevent null pointer dereference during initialization
int* CHR_DBG_4bytesAddr = (CHR_DBG_FLAGSAddr != 0) ? (int*)(CHR_DBG_FLAGSAddr + (byte)0x2) : nullptr;
uintptr_t CHR_DBG_FLAGSReal = (CHR_DBG_FLAGSAddr != 0 && CHR_DBG_4bytesAddr != nullptr) ? 
    readAddress(CHR_DBG_FLAGSAddr, *CHR_DBG_4bytesAddr, 7) : 0;

Function-Level Safety Checks

if (ImGui::Button("FREEZE ENEMIES", ImVec2(ImGui::GetContentRegionAvail().x-1, NULL)))
{
    // Safety check: Only proceed if CHR_DBG_FLAGSReal is valid
    if (CHR_DBG_FLAGSReal != 0) {
        isFreezeEnemies = !isFreezeEnemies;
        // Safe memory operations...
    }
    else {
        // Reset the toggle state if the memory address is invalid
        isFreezeEnemies = false;
    }
}

Functions Protected

Applied safety checks to all 9 functions that write to CHR_DBG_FLAGSReal:

• FREEZE ENEMIES (primary reported issue) - CHR_DBG_FLAGSReal + 0xe
• GOD MODE - CHR_DBG_FLAGSReal + 0x0
• INF STAMINA - CHR_DBG_FLAGSReal + 0x4
• INFINITE MAGIC - CHR_DBG_FLAGSReal + 0x5
• UNLIMITED ARROWS - CHR_DBG_FLAGSReal + 0x6
• UNLIMITED CONSUMABLES - CHR_DBG_FLAGSReal + 0x3
• ONE HIT KILL - CHR_DBG_FLAGSReal + 0x2
• ENEMIES DON'T ATTACK - CHR_DBG_FLAGSReal + 0xd
• ALL GOD MODE - CHR_DBG_FLAGSReal + 0xa

Benefits

• No more crashes: Prevents game freezes and crashes when signature scanning fails
• Graceful degradation: Features are safely disabled when memory addresses are invalid
• Preserved functionality: Normal operation continues when addresses are valid
• Clear feedback: Existing red text indicator shows when features are unavailable
• Game compatibility: Better resilience across different Elden Ring versions

Testing

The fix handles these scenarios:

1. ✅ Signature scan failure - no crashes, features disabled gracefully
2. ✅ Invalid memory addresses - safe button clicks, no memory corruption
3. ✅ Valid addresses - normal functionality preserved

Fixes #1.

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