[PATCH] powerpc/83xx: Fix few build errors with CONFIG_QUICC_ENGINE=n

[Scott Wood]

Anton Vorontsov wrote:
>   GCC can still issue the of_find_node_by_name() call. (I wonder if
>   there is any way to tell gcc that particular function doesn't
>   produce any side-effects so that gcc can optimize it away too).

__attribute__((pure))

-Scott