i2c-gpio: Fix adapter number
It turns out that platform_device.id is a "u32" so testing it for being nonnegative is useless when setting up an i2c bitbang device. Instead, do what the platform_bus code does and test it against the value "-1". Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net> Acked-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: NJean Delvare <khali@linux-fr.org>
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