net/http: fix when writeLoop exited still has request in writech

[Aoang]

When there is still a request in writech after
writeLoop exits, the request body will not be
closed and will not be retried.
The request is not sent to the server, so it can
be safely retried without regard to idempotence.

Fixes #49621

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Patch Set 3:

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Patch Set 4:

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Patch Set 4:

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Patch Set 4:

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[Aoang]

https://golang.org/cl/461675

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Patch Set 4:

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