[PATCH] vc4: no need to check return value of debugfs_create functions

[Eric Anholt]

Greg Kroah-Hartman <gregkh at linuxfoundation.org> writes:

> When calling debugfs functions, there is no need to ever check the
> return value.  The function can work or not, but the code logic should
> never do something different based on this.

Applied to drm-misc-next.  Thanks!
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