fix undefined behavior in FcSerializeResize
Caught with clang -fsanitize-trap=undefined
FcInitConfigAndLoad or any other codepath that leads into FcSerializeResize would crash on this due to UB (if -fsanitize-trap is set).
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Caught with clang -fsanitize-trap=undefined
FcInitConfigAndLoad or any other codepath that leads into FcSerializeResize would crash on this due to UB (if -fsanitize-trap is set).