Fix CRevModel process function loop stride

[xddxdd]

According to the decompilation result of CRevModel_R::ProcessReplace, the for loop should process two elements in the buffer array each time, rather than iterating over each element.

This also explains why Reverberation::Process sets bufR = bufL + 1.

This MIGHT fix the reverberation effect, although I haven't tried the change on my phone (haven't set up a Android build environment yet).

Below is my decompilation result with Ghidra for reference:

/* CRevModel_R::ProcessReplace(float*, float*, int) */
void CRevModel_R::ProcessReplace(int *param_1,int param_2,int param_3,int param_4)
{
  // ... some variable definitions ...
  
  if ((*param_1 != 0) && (iVar5 = param_4 + -1, 0 < param_4)) {
    iVar3 = param_3 + 8;
    iVar4 = param_2 + 8;
    do {
      // Load value from param_2 (bufL) and param_3 (bufR)
      fVar12 = *(float *)(iVar4 + -8);
      fVar11 = *(float *)(iVar3 + -8);
      // ... some computations and write back result ...
      // Index variable increments by 8 bytes (2 floats) each time
      iVar3 = iVar3 + 8;
      iVar4 = iVar4 + 8;
    } while (iVar5 != -1);
  }
  return;
}

[iscle]

Hi :)

You are right! Reverb was broken and I had no idea why, this explains it.

Thanks for the contribution, I will check the changes on my phone and if it works I'll accept the PR.

Regards,
Iscle