[bug report] mfd/htc-i2cpld.c wrong check in htcpld_chip_get()

[Dan Carpenter <error27@gmail.com>]

Hi Cory,

Smatch complains that the check is wrong on line 280 from
drivers/mfd/htc-i2cpld.c

drivers/mfd/htc-i2cpld.c +280 htcpld_chip_get(12)
	warn: can 'chip_data' even be NULL?

   278          /* Try out first */
   279          chip_data = container_of(chip, struct htcpld_chip, chip_out);
   280          if (!chip_data) {
   281                  /* Try in */
   282                  is_input = 1;
   283                  chip_data = container_of(chip, struct htcpld_chip, chip_in);
   284                  if (!chip_data)
   285                          return -EINVAL;
   286          }

container_of() takes the chip pointer and subtracts a small number (it
subtracts the offset of the chip_out element from the start of the
htcpld_chip struct).  So basically it's never NULL.  I'm not sure what
the correct check should be here, can you take a look?

regards,
dan carpenter