Fix unefined behavior issue in qsort call
In some cases this qsort call can ba made with null pointer. It's not a fatal for program but causes undefined behavior. It can be found with Clang USAN.
Edited by Andrey Prokopyuk
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In some cases this qsort call can ba made with null pointer. It's not a fatal for program but causes undefined behavior. It can be found with Clang USAN.