[issue13020] structseq.c: refleak

[Torsten Landschoff]

Torsten Landschoff <t.landschoff at gmx.net> added the comment:

+1 for the patch.
All the error paths above the change do

  Py_DECREF(arg);
  return NULL;

arg is initialized with PySequence_Fast, which returns a new reference.
Hard to create a test case for this...

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nosy: +torsten

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