fix stack dumps from printing an infinite amount of <0> in some cases

reactos/ntoskrnl/ke/i386

diff -u -r1.98 -r1.99
--- exp.c	14 Dec 2004 03:46:10 -0000	1.98
+++ exp.c	18 Dec 2004 20:26:03 -0000	1.99
@@ -632,10 +632,11 @@

 	DbgPrint("Frames: ");
 	while ( MmIsAddressValid(Frame) )
 	{

-		if (!KeRosPrintAddress((PVOID)Frame[1]))
-		{
-			DbgPrint("<%X>", (PVOID)Frame[1]);
-		}

+		ULONG Addr = Frame[1];
+		if (!KeRosPrintAddress((PVOID)Addr))
+			DbgPrint("<%X>", Addr);
+		if ( Addr == 0 || Addr == 0xDEADBEEF )
+			break;

 		Frame = (PULONG)Frame[0];
 		DbgPrint(" ");
 	}

@@ -661,13 +662,9 @@

 	{
 		ULONG Addr = Frame[1];
 		if (!KeRosPrintAddress((PVOID)Addr))

-		{

 			DbgPrint("<%X>", Addr);

-		}

 		if ( Addr == 0 || Addr == 0xDEADBEEF )

-		{

 			break;

-		}

 		Frame = (PULONG)Frame[0];
 		DbgPrint(" ");
 	}