[issue7652] Merge C version of decimal into py3k.

[Stefan Krah]

Stefan Krah <stefan-usenet at bytereef.org> added the comment:

Thanks, Amaury! -- "goto malloc_error" should not leak, because there's always
a jump to the "out" label in line 7563.

I use this idiom a lot ever since I saw it in several places in the Linux
kernel. Of course it's a matter of taste.

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