video/hdmi: Reject illegal picture aspect ratios

AVI infoframe can only carry none, 4:3, or 16:9 picture aspect
ratios. Return an error if the user asked for something different.

Cc: Shashank Sharma <[e-mail]>
Cc: "Lin, Jia" <[e-mail]>
Cc: Akashdeep Sharma <[e-mail]>
Cc: Jim Bride <[e-mail]>
Cc: Jose Abreu <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: Emil Velikov <[e-mail]>
Cc: Thierry Reding <[e-mail]>
Cc: Hans Verkuil <[e-mail]>
Cc: [e-mail]
Signed-off-by: Ville Syrjälä <[e-mail]>
Reviewed-by: Jose Abreu <[e-mail]>
Signed-off-by: Maarten Lankhorst <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/hdmi.c

···
 	if (size < length)
 		return -ENOSPC;
 
+	if (frame->picture_aspect > HDMI_PICTURE_ASPECT_16_9)
+		return -EINVAL;
+
 	memset(buffer, 0, size);
 
 	ptr[0] = frame->type;