input: mouse_set should check input device type.

Otherwise, the index of an input device like a usb-kbd is silently accepted.

(qemu) info mice
  Mouse #2: QEMU PS/2 Mouse
* Mouse #3: QEMU HID Mouse
(qemu) mouse_set 1
(qemu) info mice
  Mouse #2: QEMU PS/2 Mouse
* Mouse #3: QEMU HID Mouse

Also replace monitor_printf() call in do_mouse_set() with error_report() and
adjust error message.

Signed-off-by: Hani Benhabiles <hani@linux.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

ui/input.c

@@ -342,15 +342,21 @@ void do_mouse_set(Monitor *mon, const QDict *qdict)
     int found = 0;
 
     QTAILQ_FOREACH(s, &handlers, node) {
-        if (s->id == index) {
-            found = 1;
-            qemu_input_handler_activate(s);
-            break;
+        if (s->id != index) {
+            continue;
         }
+        if (!(s->handler->mask & (INPUT_EVENT_MASK_REL |
+                                  INPUT_EVENT_MASK_ABS))) {
+            error_report("Input device '%s' is not a mouse", s->handler->name);
+            return;
+        }
+        found = 1;
+        qemu_input_handler_activate(s);
+        break;
     }
 
     if (!found) {
-        monitor_printf(mon, "Mouse at given index not found\n");
+        error_report("Mouse at index '%d' not found", index);
     }
 
     qemu_input_check_mode_change();