iio: proximity: sx9500: Fix a spelling postive to positive

s/postive/positive/

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210210085704.1228068-1-unixbhaskar@gmail.com


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