iio: adc: imx93: fix a signedness bug in imx93_adc_read_raw()
The problem is these lines:
ret = vref_uv = regulator_get_voltage(adc->vref);
if (ret < 0)
The "ret" variable is type long and "vref_uv" is u32 so that means
the condition can never be true on a 64bit system. A negative error
code from regulator_get_voltage() would be cast to a high positive
u32 value and then remain a high positive value when cast to a long.
The "ret" variable only ever stores ints so it should be declared as
an int. We can delete the "vref_uv" variable and use "ret" directly.
Fixes:
7d02296ac8b8 ("iio: adc: add imx93 adc support")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Link: https://lore.kernel.org/r/Y+utEvjfjQRQo2QB@kili
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>