staging: sbe-2t3e3: Fix possible reuse of freed memory in timer function

Do not call kfree() till timer function is finished.

[This was found using grep. Compilation tested only]

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
CC: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>