staging: ks7010: fix off by one error

Bug introduced in commit 7676b724 by Tobin C. Harding.

Remove equals sign from comparison, fixing off by one error.

Fixes: 7676b724 ("staging: ks7010: move comparison to right hand side")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>