Input: da7280 - fix missing error test

An "if" testing for error condition has accidentally been dropped from
the code.
Reported-by: Nkernel test robot <lkp@intel.com>
Fixes: cd3f6098 ("Input: new da7280 haptic driver")
Reviewed-by: NRoy Im <Roy.Im.Opensource@diasemi.com>
Link: https://lore.kernel.org/r/X9j8lGFgijzHyYZZ@google.comSigned-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/da7280.c

@@ -863,6 +863,7 @@ static void da7280_parse_properties(struct device *dev,
 		gpi_str3[7] = '0' + i;
 		haptics->gpi_ctl[i].polarity = 0;
 		error = device_property_read_string(dev, gpi_str3, &str);
+		if (!error)
 			haptics->gpi_ctl[i].polarity =
 				da7280_haptic_of_gpi_pol_str(dev, str);
 	}