ACPI: EC: acpi_ec_remove(): fix use-after-free

This patch fixes an obvious use-after-free introduced by
commit 837012ed.

Spotted by the Coverity checker.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>