staging: ft1000: Fix error goto statements.

With commit 2dab1ac8 there
was intruduced error which lead to stopping uninitialized
kthread which leads to kernel panics.

This patch fix problems with common entry point in correct
way.

Signed-off-by: Marek Belisko <marek.belisko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>