qmgr: Memory allocation size fix

[Andrew Talbot]

Changelog:
    qmgr: Memory allocation size fix.

diff --git a/dlls/qmgr/file.c b/dlls/qmgr/file.c
index 84cd30c..1ca1bf3 100644
--- a/dlls/qmgr/file.c
+++ b/dlls/qmgr/file.c
@@ -355,7 +355,7 @@ static const IBindStatusCallbackVtbl DLBindStatusCallback_Vtbl =
 static DLBindStatusCallback *DLBindStatusCallbackConstructor(
     BackgroundCopyFileImpl *file)
 {
-    DLBindStatusCallback *This = HeapAlloc(GetProcessHeap(), 0, sizeof This);
+    DLBindStatusCallback *This = HeapAlloc(GetProcessHeap(), 0, sizeof *This);
     if (!This)
         return NULL;