fastfat: cdfs: kernel32_winetest:path triggers 'NumberOfBytes != 0' assertion

http://reactos.org/testman/detail.php?id=5255196&prev=5254076

The resolved backtrace reads:
Assertion 'NumberOfBytes != 0' failed at ../../ntoskrnl/mm/ARM3/expool.c line 1445
Entered debugger on embedded INT3 at 0x0008:0x8091d712.
kdb:> bt
Eip:
<NTOSKRNL.EXE:11d713 (../../lib/rtl/i386/debug_asm.S:35 (_DbgBreakPoint@0))>
Frames:
<NTOSKRNL.EXE:970ee (../../ntoskrnl/mm/ARM3/expool.c:1445 (ExAllocatePoolWithTag@12))>
<NTOSKRNL.EXE:f4fa3 (../../ntoskrnl/rtl/libsupp.c:104 (RtlpAllocateMemory@8))>
<NTOSKRNL.EXE:1264f5 (../../lib/rtl/unicode.c:1825 (RtlUpcaseUnicodeString@12))>
<fastfat.sys:26de (../../drivers/filesystems/fastfat/create.c:262 (FindFile))>
<fastfat.sys:3790 (../../drivers/filesystems/fastfat/dir.c:401 (DoQuery))>
<fastfat.sys:3825 (../../drivers/filesystems/fastfat/dir.c:485 (VfatDirectoryControl))>
<fastfat.sys:aba9 (../../drivers/filesystems/fastfat/misc.c:119 (VfatDispatchRequest))>
<fastfat.sys:ad82 (../../drivers/filesystems/fastfat/misc.c:162 (VfatBuildRequest@8))>
<NTOSKRNL.EXE:6aba8 (../../ntoskrnl/io/iomgr/irp.c:1169 (@IofCallDriver@8))>
<NTOSKRNL.EXE:63667 (../../ntoskrnl/io/iomgr/iofunc.c:135 (IopPerformSynchronousRequest@28))>
<NTOSKRNL.EXE:671b9 (../../ntoskrnl/io/iomgr/iofunc.c:1596 (NtQueryDirectoryFile@44))>
<NTOSKRNL.EXE:108ebf (../../ntoskrnl/ke/i386/traphdlr.c:1624 (@KiFastCallEntryHandler@8))>
<NTOSKRNL.EXE:106ae5 (../../ntoskrnl/ke/i386/trap.s:150 (_KiFastCallEntry))>
<ntdll.dll:b0a1>
<kernel32.dll:230a7 (../../dll/win32/kernel32/client/file/find.c:430 (InternalFindFirstFile@12))>
<kernel32.dll:23134 (../../dll/win32/kernel32/client/file/find.c:671 (FindFirstFileExW@24))>
<kernel32.dll:232c9 (../../dll/win32/kernel32/client/file/find.c:623 (FindFirstFileW@8))>
<kernel32.dll:af50 (../../dll/win32/kernel32/client/path.c:1571 (GetLongPathNameW@12))>
<kernel32.dll:b155 (../../dll/win32/kernel32/client/path.c:1693 (GetLongPathNameA@12))>
<kernel32_winetest.exe:5ddee>--- Press q to abort, any other key to continue —

<kernel32_winetest.exe:62504 (../../modules/rostests/winetests/kernel32/path.c:619 (func_path))>
<kernel32_winetest.exe:99d83 (../../include/reactos/wine/test.h:560 (run_test))>
<kernel32_winetest.exe:99f8f (../../include/reactos/wine/test.h:618 (main))>
<kernel32_winetest.exe:9a3e7 (../../lib/sdk/crt/startup/crtexe.c:310 (__tmainCRTStartup))>
<kernel32_winetest.exe:9a449 (../../lib/sdk/crt/startup/crtexe.c:168 (WinMainCRTStartup))>
<kernel32.dll:fb16>
<00000000>
kdb:>
[SYSREG] Rebooting VM (retry 1)