ntdll: fix large block realloc annotation

[Dan Kegel]

http://bugs.winehq.org/show_bug.cgi?id=21336
looks mostly fixed, but the annotation is still a bit off.
This moves it to the right spot.  Fixes the spurious warnings

Invalid read of size 1
   at test_sized_HeapReAlloc (heap.c:76)
   by func_heap (heap.c:798)
 Address 0x7f340020 is on thread 1's stack

Invalid free() / delete / delete[]
   at RtlFreeHeap (heap.c:262)
   by test_sized_HeapReAlloc (heap.c:77)
   by func_heap (heap.c:798)
 Address 0x7f340020 is on thread 1's stack
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