[U-Boot] w1: fix data abort if no one wire bus master present

[Tom Rini]

On Mon, Oct 22, 2018 at 06:31:08PM +0200, Martin Fuzzey wrote:

> When the "w1 bus" command is used with no bus master present
> a data abort may occur.
> 
> This is because uclass_first_device() returns zero, but sets the output
> struct udevice pointer to NULL in the no device found case.
> 
> Fix w1_get_bus() to account for this and return an error code
> as is expected by the callers.
> 
> Signed-off-by: Martin Fuzzey <martin.fuzzey at flowbird.group>
> Reviewed-by: Eugen Hristev <eugen.hristev at microchip.com>

Applied to u-boot/master, thanks!

-- 
Tom
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