regedit: avoid assigning a variable to itself (LLVM/Clang)

[Austin English]

Also slightly improve error handling.

-- 
-Austin
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diff --git a/programs/regedit/main.c b/programs/regedit/main.c
index 27bc26f..4815b2f 100644
--- a/programs/regedit/main.c
+++ b/programs/regedit/main.c
@@ -29,6 +29,10 @@
 #define REGEDIT_DECLARE_FUNCTIONS
 #include "main.h"
 
+#include "wine/debug.h"
+
+WINE_DEFAULT_DEBUG_CHANNEL(regedit);
+
 WCHAR g_pszDefaultValueName[64];
 
 BOOL ProcessCmdLine(LPSTR lpCmdLine);
@@ -113,8 +117,11 @@ static BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
                                               GetSystemMetrics(SM_CXSMICON), GetSystemMetrics(SM_CYSMICON), LR_SHARED)
 
                          };
-    ATOM hChildWndClass = RegisterClassEx(&wcChild); /* register child windows class */
-    hChildWndClass = hChildWndClass; /* warning eater */
+
+    if(!RegisterClassEx(&wcChild)) /* register child windows class */
+    {
+        WINE_ERR("Could not register child window class\n");
+    }
 
     hMenuFrame = LoadMenuW(hInstance, MAKEINTRESOURCEW(IDR_REGEDIT_MENU));
     hPopupMenus = LoadMenuW(hInstance, MAKEINTRESOURCEW(IDR_POPUP_MENUS));