net: discard unrooted 254 byte names, not rooted ones

[mateusz834]

Fixes #54285

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Message from Ian Lance Taylor:

Patch Set 5: Run-TryBot+1

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Message from Gopher Robot:

Patch Set 5:

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Message from Gopher Robot:

Patch Set 5: TryBot-Result+1

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Message from Mateusz Poliwczak:

Patch Set 6:

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Message from Damien Neil:

Patch Set 7: Run-TryBot+1 Code-Review+2

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Message from Gopher Robot:

Patch Set 7:

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Message from Gopher Robot:

Patch Set 7: TryBot-Result+1

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Message from Than McIntosh:

Patch Set 7: Code-Review+1

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This PR is being closed because golang.org/cl/421674 has been merged.