[PATCH] gpio: aspeed: avoid return type warning

[Andrew Jeffery]

On Wed, 11 Dec 2019, at 06:58, Arnd Bergmann wrote:
> gcc has a hard time tracking whether BUG_ON(1) ends
> execution or not:
> 
> drivers/gpio/gpio-aspeed-sgpio.c: In function 'bank_reg':
> drivers/gpio/gpio-aspeed-sgpio.c:112:1: error: control reaches end of 
> non-void function [-Werror=return-type]
> 
> Use the simpler BUG() that gcc knows cannot continue.
> 
> Fixes: f8b410e3695a ("gpio: aspeed-sgpio: Rename and add Kconfig/Makefile")
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>

Acked-by: Andrew Jeffery <andrew at aj.id.au>