shell32: shlfileop.c: avoid buffer overflow during test, avoid printing garbage

[Dan Kegel]

Two changes:
1) don't intentionally cause a buffer overflow during the test
(all we intended to do was to test with filenames longer
than MAX_PATH)
2) initialize a variable to avoid logging garbage during SHGetFileInfoA()

This should be more correct, and makes Valgrind happier, too.
Thanks to James for feedback on an early draft.
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