console: use get_uint() for "head" property

TYPE_QEMU_CONSOLE property "head" is defined with
object_property_add_uint*_ptr().

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20170607163635.17635-41-marcandre.lureau@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

ui/console.c

@@ -1872,8 +1872,8 @@ QemuConsole *qemu_console_lookup_by_device(DeviceState *dev, uint32_t head)
         if (DEVICE(obj) != dev) {
             continue;
         }
-        h = object_property_get_int(OBJECT(consoles[i]),
-                                    "head", &error_abort);
+        h = object_property_get_uint(OBJECT(consoles[i]),
+                                     "head", &error_abort);
         if (h != head) {
             continue;
         }