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>
diff --git a/include/video.h b/include/video.h
index c7afe22..4ec71ab 100644
--- a/include/video.h
+++ b/include/video.h
@@ -57,12 +57,8 @@
 	VIDEO_BPP32,
 };
 
-/*
- * Convert enum video_log2_bpp to bytes and bits. Note we omit the outer
- * brackets to allow multiplication by fractional pixels.
- */
+/* Convert enum video_log2_bpp to bytes and bits */
 #define VNBYTES(bpix)	((1 << (bpix)) / 8)
-
 #define VNBITS(bpix)	(1 << (bpix))
 
 enum video_format {