Fix client crash from invalid sound FFT band counts

[HeresHavi]

Summary

Added FFT band-count validation for sound elements and player voice.

Band counts from zero through half the requested FFT sample count remain valid. Negative values and values above the available half-spectrum now return false before FFT extraction or allocation.

Motivation

getSoundFFTData accepted any signed band count. A value of -1 reached new float[iBands] and became an extremely large allocation request, causing MTA's out-of-memory handler to terminate the client.

For example, a resource might use FFT data to draw a music visualizer and allow the number of bands to come from a setting. If that value becomes negative or exceeds the available spectrum, the old code could terminate the player's client or read beyond the FFT data.

The reported out-of-memory error was caused by the invalid allocation size. The machine had not actually run out of memory.

Crash Stack

RaiseException
OutOfMemory
HandleMemoryAllocationFailure
_callnewh
operator new
CStaticFunctionDefinitions::GetSoundFFTData
CLuaAudioDefs::GetSoundFFTData
luaD_precall
luaV_execute
luaD_call
lua_pcall
CLuaMain::PCall

Test plan

Runtime

• Valid Case: A 256-sample FFT with 16 bands returned a table containing 16 entries before and after the fix.
• Before Fix: Requesting bands = -1 terminated the client through the out-of-memory handler.
• After Fix: The same negative band count returned false, and the client stayed open.
• Maximum Case: bands = 128 returned a table containing 128 entries.
• Boundary Case: bands = 129 returned false, and the client stayed open.

Builds and Tests

• Debug | Win32: Full build passed, 304 client tests passed.
• Release | Win32: Full build passed, 304 client tests passed.
• Debug | x64: Full build passed.
• Release | x64: Full build passed.
• Ran clang-format.

Checklist

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