staging: lustre: llite: don't clean in_data again

We have got a zero buffer for in_data as we use
kzalloc here. So let's remove it anyway.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>