[Bug 36171] valgrind shows several leaks in winmm/waveform.c

https://bugs.winehq.org/show_bug.cgi?id=36171

--- Comment #1 from Austin English  ---
==5787== 512 bytes in 1 blocks are definitely lost in loss record 671 of 838
==5787==    at 0x7BC4C6B7: notify_alloc (heap.c:255)
==5787==    by 0x7BC50EFB: RtlAllocateHeap (heap.c:1716)
==5787==    by 0x5106C7C: list_window_children (win.c:318)
==5787==    by 0x510EDFE: WIN_ListChildren (win.c:3267)
==5787==    by 0x510B6CA: DestroyWindow (win.c:1854)
==5787==    by 0x4FBF40A: WINMM_DevicesThreadDone (waveform.c:2445)
==5787==    by 0x4FBF896: WINMM_DevicesThreadProc (waveform.c:2516)
==5787==    by 0x7BC87017: ??? (signal_i386.c:2571)
==5787==    by 0x7BC87060: call_thread_func (signal_i386.c:2630)
==5787==    by 0x7BC86FF5: ??? (signal_i386.c:2571)
==5787==    by 0x7BC8E43C: start_thread (thread.c:428)
==5787==    by 0x4218F92: start_thread (pthread_create.c:309)
==5787==    by 0x431D7ED: clone (clone.S:129)

==6184== 44,101 bytes in 1 blocks are definitely lost in loss record 827 of 828
==6184==    at 0x7BC4C6B7: notify_alloc (heap.c:255)
==6184==    by 0x7BC50EFB: RtlAllocateHeap (heap.c:1716)
==6184==    by 0x4E754B7: test_fragmentsize (wave.c:1560)
==6184==    by 0x4E75868: func_wave (wave.c:1602)
==6184==    by 0x4E7665B: run_test (test.h:584)
==6184==    by 0x4E76A4A: main (test.h:654)
==6184==