[issue3797] mmap, dbm, ossaudiodev, marshal & winreg return bytearray instead of bytes

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

- PyBytes_Resize takes a PyObject**, you should pass &rv. Didn't you get
a compiler warning?

- Here is an additional test for the winreg module, your patch is needed
for it to pass.

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nosy: +amaury.forgeotdarc

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