video: Fix VNBYTES() macro comment
The VNBYTES() macro has been updated to silence possible warnings
regarding authorized (but unusual) uses of this macro, but the comment
was kept unchanged. A year has passed so let's fix the comment now to
avoid confusions.
Fixes: cc05d352fbc ("video: Add parentheses around VNBYTES() macro")
Suggested-by: Tom Rini <trini@konsulko.com>
Link: https://lore.kernel.org/u-boot/20240906183432.GG3879073@bill-the-cat/
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>