close screen framebuffer when exiting reader

frontend/ui/device/screen.lua

@@ -239,6 +239,11 @@ function Screen:restoreFromBB(bb)
     end
 end
 
+function Screen:close()
+    DEBUG("close screen framebuffer")
+    self.fb:close()
+end
+
 function Screen:getDPIMenuTable()
     local function dpi() return G_reader_settings:readSetting("screen_dpi") end
     local function custom() return G_reader_settings:readSetting("custom_screen_dpi") end

frontend/ui/uimanager.lua

@@ -358,7 +358,7 @@ function UIManager:run()
 
         -- stop when we have no window to show
         if #self._window_stack == 0 then
-            DEBUG("no dialog left to show, would loop endlessly")
+            DEBUG("no dialog left to show")
             self:quit()
             return nil
         end

reader.lua

@@ -38,8 +38,6 @@ function exitReader()
 
     G_reader_settings:close()
 
-    input.closeAll()
-
     -- Close lipc handles
     KindlePowerD:coda()
     ReaderActivityIndicator:coda()
@@ -64,6 +62,9 @@ function exitReader()
         end
     end
 
+    input.closeAll()
+    Screen:close()
+
     if Profiler then Profiler.stop() end
     os.exit(0)
 end