KASAN: use-after-free Read in add_uevent_var

[Wolfram Sang]

> > The bug was bisected to:
> > 
> > commit 0a1c7959acd9674a0e4e59f911f3e5fbf25fd693
> > Author: Wolfram Sang <wsa at the-dreams.de>
> > Date:   Wed May 17 15:22:18 2017 +0000
> > 
> >     gpu: drm: tc35876x: move header file out of I2C realm
> 
> Bisect seems to have gone off the rails. No idea where or why.

Yes, luckily it was obvious here, saving us from chasing ghosts.

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