Clean the code a bit

I ran splint on the code and it complained a lot...

dirot.c

@@ -2,8 +2,6 @@
 #include <X11/extensions/Xrandr.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
-#include <err.h>
 
 void test_and_fail(void *ptr, char *msg) {
 	if (ptr == NULL) {
@@ -25,7 +23,6 @@ int main (void) {
 	test_and_fail(dpy, "Could not open display");
 
 	int screen_number = XDefaultScreen(dpy);
-	Screen *screen = XDefaultScreenOfDisplay(dpy);
 	Window root = XRootWindow(dpy, screen_number);
 
 	// TODO: Early check that RandR is supported by dpy
@@ -42,5 +39,6 @@ int main (void) {
 	XRRSetScreenConfig(dpy, cfg, root, XRRConfigCurrentConfiguration(cfg, &cfg_rot), new, XRRConfigTimes(cfg, &cfg_ts));
 	
 	XRRFreeScreenConfigInfo(cfg);
+	XCloseDisplay(dpy);
 	return 0;
 }