staging: ks7010: Remove the explicit cast on kmalloc

The assignment operator implicitly converts a void pointer to the type of the
pointer it is assigned to. Hence an explicit cast on the result of the kmalloc
function is not required.

Signed-off-by: sayli karnik <karniksayli1995@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>