Fix some warnings

Non-obvious fixes:

WINGs/wfilepanel.c: Cast to void to avoid an unused calculated value
warning.

WINGs/wtabview.c: Test tab<0 to avoid a warning from the next condition
about signed overflow in an inlined invocation of the function.

Signed-off-by: Brad Jorsch <anomie@users.sourceforge.net>

src/actions.c

@@ -1225,10 +1225,8 @@ void wHideAll(WScreen *scr)
 {
 	WWindow *wwin;
 	WWindow **windows;
-	Window FocusedWin;
 	WMenu *menu;
 	unsigned int wcount = 0;
-	int FocusState;
 	int i;
 
 	if (!scr)

src/event.c

@@ -914,7 +914,6 @@ static void handlePropertyNotify(XEvent * event)
 	Window jr;
 	int ji;
 	unsigned int ju;
-	WScreen *scr;
 
 	wwin = wWindowFor(event->xproperty.window);
 	if (wwin) {
@@ -927,8 +926,6 @@ static void handlePropertyNotify(XEvent * event)
 	if (wapp) {
 		wClientCheckProperty(wapp->main_window_desc, &event->xproperty);
 	}
-
-	scr = wScreenForWindow(event->xproperty.window);
 }
 
 static void handleClientMessage(XEvent * event)

src/startup.c

@@ -508,7 +508,10 @@ static char *atomNames[] = {
 void StartUp(Bool defaultScreenOnly)
 {
 	struct sigaction sig_action;
-	int j, max, dummy;
+	int j, max;
+#ifdef HAVE_XRANDR
+	int dummy;
+#endif
 	Atom atom[sizeof(atomNames) / sizeof(char *)];
 
 	/*