[PATCH] regmap: Add function check before called format_val

[Mark Brown]

On Mon, Jul 20, 2015 at 08:41:50PM +0800, Henry Chen wrote:
> The regmap_format will not be initialize since regmap_bus is not assgined 
> on regmap_init(). It should has a function check before using 
> format_val() to avoid null function called on regmap_bulk_read().

> -			map->format.format_val(val + (i * val_bytes), ival, 0);
> +			if (map->format.format_val)
> +				map->format.format_val(val + (i * val_bytes), ival, 0);
> +			else
> +				memcpy(val + (i * val_bytes), &ival, val_bytes);

Your changelog doesn't explan why we are in this code path in the first
place without a format_val() and why a memcpy() is an appropriate
replacement.  It should, it's not clear to me that this is a good fix
but I don't feel I fully understand the problem.
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