wmaker: Marked args as unused for compiler in X Error handlers

When an error occurs in X, the Xlib is using a callback mechanism to
execute application code to handle the problem, which means having a
fixed argument list for that application function.

It is then correct to not use all the arguments, so this patch adds the
appropriate stuff to avoid a false report from compiler.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

src/screen.c

@@ -109,6 +109,10 @@ static void make_keys(void)
  */
 static int alreadyRunningError(Display * dpy, XErrorEvent * error)
 {
+	/* Parameter not used, but tell the compiler that it is ok */
+	(void) dpy;
+	(void) error;
+
 	CantManageScreen = 1;
 	return -1;
 }
@@ -520,7 +524,7 @@ WScreen *wScreenInit(int screen_number)
 	scr->fakeGroupLeaders = WMCreateArray(16);
 
 	CantManageScreen = 0;
-	oldHandler = XSetErrorHandler((XErrorHandler) alreadyRunningError);
+	oldHandler = XSetErrorHandler(alreadyRunningError);
 
 	event_mask = EVENT_MASK;
 

src/startup.c

@@ -127,6 +127,9 @@ static int catchXError(Display * dpy, XErrorEvent * error)
  */
 static int handleXIO(Display * xio_dpy)
 {
+	/* Parameter not used, but tell the compiler that it is ok */
+	(void) xio_dpy;
+
 	dpy = NULL;
 	Exit(0);
 	return 0;

src/texture.c

@@ -110,6 +110,10 @@ WTexSolid *wTextureMakeSolid(WScreen * scr, XColor * color)
 
 static int dummyErrorHandler(Display * foo, XErrorEvent * bar)
 {
+	/* Parameter not used, but tell the compiler that it is ok */
+	(void) foo;
+	(void) bar;
+
 	return 0;
 }