ktmw32: add a stub for RollbackTransaction

[Austin English]

Called by Windows Live Essentials when an install is attempted on an
unsupported (XP) OS version.

-- 
-Austin
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diff --git a/dlls/ktmw32/ktmw32.spec b/dlls/ktmw32/ktmw32.spec
index 0d549bf..895e990 100644
--- a/dlls/ktmw32/ktmw32.spec
+++ b/dlls/ktmw32/ktmw32.spec
@@ -35,7 +35,7 @@
 @ stub RenameTransactionManager
 @ stub RollbackComplete
 @ stub RollbackEnlistment
-@ stub RollbackTransaction
+@ stdcall RollbackTransaction(ptr)
 @ stub RollbackTransactionAsync
 @ stub RollforwardTransactionManager
 @ stub SetEnlistmentRecoveryInformation
diff --git a/dlls/ktmw32/ktmw32_main.c b/dlls/ktmw32/ktmw32_main.c
index 328ddb5..35d1e85 100644
--- a/dlls/ktmw32/ktmw32_main.c
+++ b/dlls/ktmw32/ktmw32_main.c
@@ -49,3 +49,13 @@ HANDLE WINAPI CreateTransaction(LPSECURITY_ATTRIBUTES pattr, LPGUID pguid, DWORD
 
     return (HANDLE) 1;
 }
+
+/***********************************************************************
+ * Rollback Transaction (ktmw32.@)
+ */
+BOOL WINAPI RollbackTransaction(HANDLE transaction)
+{
+    FIXME("stub: %p\n", transaction);
+    SetLastError(ERROR_ACCESS_DENIED);
+    return FALSE;
+}