leak fix: free the mutable array copy used for sorting

src/display_manager.c

@@ -124,6 +124,7 @@ CFStringRef display_manager_arrangement_display_uuid(int arrangement)
             CFMutableArrayRef mut_displays = CFArrayCreateMutableCopy(NULL, count, displays);
             CFArraySortValues(mut_displays, all, &coordinate_comparator, NULL);
             result = CFArrayGetValueAtIndex(mut_displays, index);
+            CFRelease(mut_displays);
         }
     }