"pdata" and "pchg->pdata" are the same.  Changing the function call to
pdata->get_batt_present() makes it match the check and it's a little
cleaner.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NMilo Kim <milo.kim@ti.com>
Signed-off-by: NAnton Vorontsov <anton@enomsg.org>