Fixed issue #5734 (FreeBoy Division by zero)

[aidan-mueller]

Added comments and used more descriptive variable names for noise
channel initialization block.

Also indented the nested for loop to improve code clarity.
The reasons for doing this can be found in this answer:
https://softwareengineering.stackexchange.com/a/362796

[LmmsBot]

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Windows

• Windows 32-bit: lmms-1.3.0-alpha.1.217+g476add8ab-mingw-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha.1.217+g476add8ab-mingw-win64.exe (build link)
• Windows 32-bit: lmms-1.3.0-alpha-msvc2017-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha-msvc2017-win64.exe (build link)

macOS

• macOS : lmms-1.3.0-alpha.1.217+g476add8ab-mac10.14.dmg (build link)

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[DomClark]

@PhysSong noted this in the associated issue:

Also, (r, s) = (0, n) is equivalent to (r, s) = (1, n - 1), so we don't have to check for r = 0 unless s = 0.

Perhaps it would be simpler to use r = 0 and s = 0 for the initial guess outside the loops, then start the inner loop from r = 1?

[aidan-mueller]

@DomClark You are correct. I actually saw that comment, but for some reason I didn't quite understand what he was saying until now (facepalm).

Edit:

Perhaps it would be simpler to use r = 0 and s = 0 for the initial guess outside the loops, then start the inner loop from r = 1?

I was thinking the same thing.

I'll add a commit to change this, and perhaps while I'm at it I'll also spend a bit of time trying to optimize further if I can.