Bugfix/abi stack buffer overflow

[mgrzeschik]

I reworked the branch from @wdl-creston #72 and found that the changes can actually be split up which make the actual ABI change more obvious.

[mgrzeschik]

The first three patches are noninvasive and should not change the ABI. I could move them to another MR and add them to the 0.3.0 release. @wdl83 What do you think? Can you review them?

[wdl83]

The first three patches are noninvasive and should not change the ABI. I could move them to another MR and add them to the 0.3.0 release. @wdl83 What do you think? Can you review them?

Hi, not sure which changes are not affecting ABI, looks like 99% does. Does it make sense to split anything?

BTW: this is the change needed to get VIDEO streaming working with dummy_hcd.
I took you patch as base and fixed a few issues. I was able to correctly stream MJPEG and H264 with my framebased changes to usb-gadgets (branch on my fork).
wdl83/linux@master...wdl83:linux:dummy_hcd_ISOC_v6.1