[Bug 36338] valgrind shows a potential leak in comcat/tests/comcat.c

https://bugs.winehq.org/show_bug.cgi?id=36338

--- Comment #1 from Austin English  ---
One more:
==16980== 28 bytes in 1 blocks are possibly lost in loss record 170 of 603
==16980==    at 0x7BC4DC87: initialize_block (heap.c:233)
==16980==    by 0x7BC4DC87: RtlAllocateHeap (???:0)
==16980==    by 0x4D05B34: apartment_getclassobject (compobj.c:542)
==16980==    by 0x4D08817: get_inproc_class_object (compobj.c:2922)
==16980==    by 0x4D0B22B: CoGetClassObject (compobj.c:3060)
==16980==    by 0x4D0C8D7: CoCreateInstance (compobj.c:3230)
==16980==    by 0x4BA501C: func_comcat (comcat.c:92)
==16980==    by 0x4BA5558: run_test (test.h:584)
==16980==    by 0x4BA4C60: main (test.h:654)
==16980==