is_decimal: Fix an integer underflow.

kgabis / parson

Lightweight JSON library written in C.

MIT License

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Open yamt opened 4 years ago

yamt commented 4 years ago

It seems harmless though.

Found by UBSAN

parson.c:270:18: runtime error: unsigned integer overflow: 0 - 1 cannot be represented in type 'size_t' (aka 'unsigned long')