url: return error at once when OOM in netrc handling

[bagder]

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[Copilot]

Pull request overview

This PR fixes incorrect error handling for out-of-memory conditions in netrc file parsing. Previously, OOM errors from Curl_parsenetrc() would be incorrectly returned as CURLE_READ_ERROR. The fix adds an early check that immediately returns CURLE_OUT_OF_MEMORY when memory allocation fails during netrc parsing.

• Adds explicit handling for NETRC_OUT_OF_MEMORY error code
• Returns the appropriate CURLE_OUT_OF_MEMORY error instead of incorrectly mapping to CURLE_READ_ERROR

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[bagder]

augment review

[augmentcode]

🤖 Augment PR Summary

Summary: Treat NETRC_OUT_OF_MEMORY from Curl_parsenetrc() as a hard failure and return CURLE_OUT_OF_MEMORY immediately.

Why: Prevents OOM during .netrc handling from being misreported as a generic read error and allows callers to react appropriately.

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[augmentcode]

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