Fix uninitialized memory read reported by Valgrind when running doctest.
This could happen if size == 0.
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@ -556,6 +556,7 @@ PyCode_CheckLineNumber(PyCodeObject* co, int lasti, PyAddrPair *bounds)
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the line increments here, treating them as byte
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the line increments here, treating them as byte
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increments gets confusing, to say the least. */
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increments gets confusing, to say the least. */
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bounds->ap_lower = 0;
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while (size > 0) {
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while (size > 0) {
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if (addr + *p > lasti)
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if (addr + *p > lasti)
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break;
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break;
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