Fix DoRead() returns error errno

[chenBright]

What problem does this PR solve?

Issue Number:

Problem Summary:

In Socket::DoRead(), when an SSL read encounters a system error (the else branch), the PLOG_IF macro may overwrite errno during logging. Since the caller of DoRead depends on a correct errno, this can cause the caller to receive a corrupted error code, leading to incorrect error handling.

What is changed and the side effects?

Changed:

Side effects:

• Performance effects:

• Breaking backward compatibility:

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Check List:

• Please make sure your changes are compilable.
• When providing us with a new feature, it is best to add related tests.
• Please follow Contributor Covenant Code of Conduct.

[wwbmmm]

LGTM