Add missing error check on BN_CTX_new()#21061
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ndossche wants to merge 1 commit intophp:PHP-8.4from
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If this fails, then the big numbers will be allocated outside of the context, leading to leaks.
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If this fails, then the big numbers will be allocated outside of the context, leading to leaks.
This was found by a hybrid static-dynamic analyser that looks for inconsistent handling of error checks in bindings.