[Bug 36594] valgrind shows uninitialized memory use in windowscodecs/tests/metadata.c

https://bugs.winehq.org/show_bug.cgi?id=36594

--- Comment #1 from Austin English  ---
Also:

==24667== Conditional jump or move depends on uninitialised value(s)
==24667==    at 0x4CD4C15: winetest_vok (test.h:311)
==24667==    by 0x4CD4E23: winetest_ok (test.h:357)
==24667==    by 0x4CBEFA5: test_metadata_png (metadata.c:940)
==24667==    by 0x4CC3DAA: func_metadata (metadata.c:1787)
==24667==    by 0x4CD57DA: run_test (test.h:584)
==24667==    by 0x4CD5BC9: main (test.h:654)
==24667==  Uninitialised value was created by a stack allocation
==24667==    at 0x4CBEA9E: test_metadata_png (metadata.c:887)
==24667==