HID: hid-steam: Remove the unused variable connected

Variable connected is not effectively used, so delete it.

drivers/hid/hid-steam.c:1153:7: warning: variable ‘connected’ set but not used.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=20462


Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>