Fix a bunch of -Wempty-body warnings reported by clang

Many of these were real bugs, like:

if (cond);
   do_something

etc...

Others were just cosmetic - like placing the ';' on a separate line to
make the intention clear.

cde/lib/DtSvc/DtUtil1/GetMwmW.c

@@ -149,7 +149,7 @@ _GetMwmWindow(
 		}
 	    }
 
-	    if (rcode == Success);
+	    if (rcode == Success)
 	    {
 		*pMwmWindow = pWmInfo->wmWindow;
 	    }