Zbigniew Jędrzejewski-Szmek
68ecb48b90
The function had a provision for NULL input, and would return NULL, but that looks like an error and all callers pass in a non-NULL arg and report oom on NULL. So assert that the input is non-NULL. All callers specifed the output buffer, so we can simplify the logic to only make an allocation if appropriate and change the return type to 'const *'. No functional change.
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