Fix Issue 20585 - std.stdio.File.open() failure leaves File in invalid

[kubo39]

state

[dlang-bot]

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	20585	normal	std.stdio.File open() failure leaves File in invalid state

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub fetch digger
dub run digger -- build "stable + phobos#7397"

[kubo39]

CI failed, couldn't reproduce in my machine. I'll add _p = null for checking.