Remove unnecessary res field in for_each_expr visitors

[y21]

Small refactor in the for_each_expr* visitors. This should not change anything functionally.

Instead of storing the final value Option<B> in the visitor and setting it to Some when we get a ControlFlow::Break(B) from the closure, we can just directly return it from the visitor itself now that visitors support that.

cc #12829 and #12830 (comment)

changelog: none

[rustbot]

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[y21]

Lintcheck seems to agree. Very nice to have for these kinds of refactors

[xFrednet]

LGTM, nice refactoring!

Lintcheck seems to agree. Very nice to have for these kinds of refactors

And yes, it is, it's insane how quickly it has become part of my workflow :3

cc: @blyxyas because of #12829 in case you're interested

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Roses are red, Continue(())
Violets are blue, Continue(())
The visitor is visiting, Continue(())
Until now Break(())

[bors]

📌 Commit de1e163 has been approved by xFrednet

It is now in the queue for this repository.

[bors]

⌛ Testing commit de1e163 with merge c7cfe7f...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: xFrednet
Pushing c7cfe7f to master...