Fix nasty condition when we were subtracting AlignedAddress (which happened to be aligned to 0x80000000) from HighestAddress (which is MmSystemRangeStart - 1 == 0x7fffffff) and then using it for length comparsion.

Modified: trunk/reactos/ntoskrnl/mm/marea.c

--- trunk/reactos/ntoskrnl/mm/marea.c	2005-03-20 11:35:39 UTC (rev 14213)
+++ trunk/reactos/ntoskrnl/mm/marea.c	2005-03-20 12:04:30 UTC (rev 14214)
@@ -491,7 +491,8 @@

 
    /* Check if there is enough space after the last memory area. */
    AlignedAddress = MM_ROUND_UP(PreviousNode->EndingAddress, Granularity);

-   if ((ULONG_PTR)HighestAddress - (ULONG_PTR)AlignedAddress >= Length)

+   if ((ULONG_PTR)HighestAddress > (ULONG_PTR)AlignedAddress &&
+       (ULONG_PTR)HighestAddress - (ULONG_PTR)AlignedAddress >= Length)

    {
       DPRINT("MmFindGapBottomUp: %p\n", AlignedAddress);
       return AlignedAddress;