ftp: return better on OOM in two places

[bagder]

Found with strict torture testing.

[Copilot]

Pull request overview

This PR improves error handling in the FTP implementation by ensuring proper early returns when out-of-memory (OOM) errors occur. The changes prevent execution of potentially risky operations when memory allocation has failed, found through strict torture testing.

• Added OOM check before attempting EPSV fallback to prevent resource cleanup with invalid state
• Added early return for OOM errors during secondary socket connection to avoid potential undefined behavior

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[bagder]

augment review

[augmentcode]

🤖 Augment PR Summary

Summary: Improve FTP out-of-memory handling by avoiding protocol-fallback paths that would mask OOM.
Changes: Skip EPSV-disable retry logic on OOM and return early when Curl_conn_connect() reports CURLE_OUT_OF_MEMORY.

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[augmentcode]

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