curl_threads: don't do another malloc if the first fails - #20095
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Pull request overview
This PR optimizes error handling in the thread creation function by preventing an unnecessary memory allocation when the initial allocation fails. The change ensures that if the first curlx_malloc for the thread handle fails, the second curlx_malloc for the actual call structure is skipped entirely.
Key changes:
- Initialize
acpointer to NULL instead of immediately allocating memory - Conditionally allocate
aconly if the thread handletwas successfully allocated - Maintains existing error handling logic at the
errlabel
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