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/programs/dtmail/MotifApp/DialogManager.C

@@ -417,9 +417,14 @@ DialogManager::forceUpdate( Widget w )
   if ( !w )
     return;
   XtAppContext cxt=XtWidgetToApplicationContext( w );
-  for (diashell=w;!XtIsShell(diashell);diashell=XtParent(diashell));
-  for ( topshell=diashell;XtIsTopLevelShell( topshell );
-	topshell = XtParent( topshell ) );
+  for (diashell=w;
+       !XtIsShell(diashell);
+       diashell=XtParent(diashell))
+      ;
+  for ( topshell=diashell;
+        XtIsTopLevelShell( topshell );
+        topshell = XtParent( topshell ) )
+      ;
 
 //  if (XtIsRealized(diashell) && XtIsRealized(topshell)){
     dpy=XtDisplay(diashell);