Avoid undefined results when the parameter is out of range.
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@ -306,7 +306,7 @@ int sk_num(const STACK *st)
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char *sk_value(const STACK *st, int i)
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{
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if(st == NULL) return NULL;
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if(!st || (i < 0) || (i >= st->num)) return NULL;
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return st->data[i];
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}
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