blk: Correct comment for blk_get_devnum_by_uclass_idname()

Update the comment to match the function. Fix the indentation while we
are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
1 file changed