[issue45385] Fix possible reference leak from descr_check

[Dong-hee Na]

Dong-hee Na <donghee.na at python.org> added the comment:

Compiler warnings from PR 28572:

Objects/descrobject.c#L183
‘res’ may be used uninitialized in this function [-Wmaybe-uninitialized]

Objects/descrobject.c#L201
‘res’ may be used uninitialized in this function [-Wmaybe-uninitialized]

Objects/descrobject.c#L217
‘res’ may be used uninitialized in this function [-Wmaybe-uninitialized]

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45385>
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