When the handler installation failed, there was no code to free the
allocated EC device. This patch fixes this memory leakage issue.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=115021Reported-and-tested-by: NLuya Tshimbalanga <luya@fedoraproject.org>
Tested-by: NJonh Henderson <jw.hendy@gmail.com>
Signed-off-by: NLv Zheng <lv.zheng@intel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>