[WiiU] Possible Freeze if Fast Forward Rate is set above 2.0x

First and foremost consider this:

• Only RetroArch bugs should be filed here. Not core bugs or game bugs

(I would put this down to a Core issue but seeing as it happens on multiple Cores I thought I'd put it in as a Retroarch issue)

Description

It's possible for some Cores to freeze when Fast Forward bind is held if the Fast Forward Rate is set above 2.0x the default is 0.0x - unlimited (no FPS cap) although the Core has crashed every now and again you can hear a note of the games music play suggesting the Core hasn't froze but more slowed down to a crawl??

Expected behavior

Expected to be able to use Fast Forward Rate at 0.0x (no FPS cap) without the Core freezing.

Actual behavior

If the Fast Forward Bind is held while the Fast Forward Rate is set above 2.0x there's a possibility of a Core freeze

Steps to reproduce the bug

1. Load one of the GB,GBA,MS Cores with default Fast Forward Rate set
2. Get ingame
3. Hold the Fast Forward Bind (happens pretty randomly, but should happen after a few press/holds of the FF Bind Button)

Bisect Results

This is a long standing issue, matter of fact it always ? happened as far as I can tell

• OS: WiiU

Start by reproducing the freeze on WiiU with the GB, GBA, or MS cores, using the default Fast Forward Rate and holding the Fast Forward bind repeatedly. Compare behavior at rates above 2.0x and at 0.0x; done means fast forward no longer freezes or slows the core to a crawl.