UPSTREAM: ANDROID: binder: re-order some conditions

It doesn't make any difference to runtime but I've switched these two
checks to make my static checker happy.

The problem is that "buffer->data_size" is user controlled and if it's
less than "sizeo(*hdr)" then that means "offset" can be more than
"buffer->data_size".  It's just cleaner to check it in the other order.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Martijn Coenen <maco@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 361f2ddb)

Change-Id: I098d525ba63d125caa9840e6e1d5004bf70edc3c