[Bug 20303] Spurious valgrind warning in HEAP_CreateSubHeap?

http://bugs.winehq.org/show_bug.cgi?id=20303

--- Comment #1 from Dan Kegel   2009-10-10 21:27:00 ---
Another error with the same root cause:

Invalid write of size 2
   at start_vfat_ioctl (directory.c:1046)
   by find_file_in_dir (directory.c:1748)
   by wine_nt_to_unix_file_name (directory.c:2111)
   by FILE_QueryFullAttributesFile (file.c:1977)
   by NtQueryAttributesFile (file.c:2034)
   by RtlDoesFileExists_U (directory.c:2204)
   by RtlDosSearchPath_U (path.c:475)
   by find_dll_file (loader.c:1833)
   by load_dll (loader.c:1923)
   by import_dll (loader.c:538)
   by fixup_imports (loader.c:711)
   by LdrInitializeThunk (loader.c:2501)
   by __wine_kernel_init (process.c:1117)
   by __wine_process_init (loader.c:2719)
   by wine_init (loader.c:711)
   by main (main.c:218)
 Address 0x7f112008 is not stack'd, malloc'd or (recently) free'd

It seems that NtAllocateVirtualMemory wasn't informing valgrind
about the blocks it created.  This didn't seem to be a problem with
old valgrind, but valgrind at top of tree (and probably 3.5.0) complains.
I will attach a patch that fixes the problem here.