internal/lsp: return when whyList less than require.

[jiacai2050]

Fixes golang/go#37977

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Patch Set 1:

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This PR (HEAD: 69b71b7) has been imported to Gerrit for code review.

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Patch Set 2:

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Patch Set 2:

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Message from Jiacai Liu:

Patch Set 2:

(1 comment)

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Patch Set 2:

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Message from tosone:

Patch Set 2: Code-Review+1

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Message from Rohan Challa:

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

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Patch Set 2:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=cbe196a4

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Patch Set 2: TryBot-Result+1

TryBots are happy.

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This PR is being closed because golang.org/cl/224591 has been merged.