[2.33 and 2.34][PATCH] Simplify __opensock and fix race condition [BZ #28353]

[pgowda cve]

Hi,

(cherry picked from commit 5bf07e1b3a74232bfb8332275110be1a5da50f83)

Please find attached the backported patch for glibc versions 2.33 and 2.34.
Please let me know if it's okay.

Regards,
Pgowda
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