serialui: Fix dereference of a null pointers (clang)

[André Hentschel]

---
 dlls/serialui/confdlg.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/dlls/serialui/confdlg.c b/dlls/serialui/confdlg.c
index 0409675..c3b0ad7 100644
--- a/dlls/serialui/confdlg.c
+++ b/dlls/serialui/confdlg.c
@@ -371,7 +371,10 @@ static INT_PTR CALLBACK SERIALUI_ConfigDialogProc(HWND hWnd, UINT uMsg, WPARAM w
 
         info = (SERIALUI_DialogInfo *) GetWindowLongPtrW(hWnd, DWLP_USER);
         if(!info)
+        {
             EndDialog(hWnd,0);
+            return FALSE;
+        }
         switch (wID)
         {
         case IDOK:
-- 

Best Regards, André Hentschel