staging: ks7010: Remove initialisation in ks7010_sdio.c

As the initial value of the return variable result is never used, it can
be removed.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>