[PATCH] mediatek: mt7601u: fix clang -Wformat warning

[Jakub Kicinski]

On Mon, 11 Jul 2022 14:29:32 -0700 Justin Stitt wrote:
> When building with Clang we encounter this warning:
> | drivers/net/wireless/mediatek/mt7601u/debugfs.c:92:6: error: format
> | specifies type 'unsigned char' but the argument has type 'int'
> | [-Werror,-Wformat] dev->ee->reg.start + dev->ee->reg.num - 1);
> 
> The format specifier used is `%hhu` which describes a u8. Both
> `dev->ee->reg.start` and `.num` are u8 as well. However, the expression
> as a whole is promoted to an int as you cannot get smaller-than-int from
> addition. Therefore, to fix the warning, use the promoted-to-type's
> format specifier -- in this case `%d`.

Acked-by: Jakub Kicinski <kubakici at wp.pl>