iio: pressure: bmp280: Remove dead error checks

The ret value is being checked already in all the previous
paths which exit in case of error, so this path can never
become true.

Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
Link: https://lore.kernel.org/r/20240508165207.145554-2-vassilisamir@gmail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>