backlight/bd6107: Compare against struct fb_info.device

Struct bd6107_platform_data refers to a platform device within
the Linux device hierarchy. The test in bd6107_backlight_check_fb()
compares it against the fbdev device in struct fb_info.dev, which
is different. Fix the test by comparing to struct fb_info.device.

Fixes a bug in the backlight driver and prepares fbdev for making
struct fb_info.dev optional.

v2:
	* move renames into separate patch (Javier, Sam, Michael)

Fixes: 67b43e590415 ("backlight: Add ROHM BD6107 backlight driver")
Signed-off-by: Thomas Zimmermann <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Daniel Thompson <[email protected]>
Cc: Jingoo Han <[email protected]>
Cc: [email protected]
Cc: <[email protected]> # v3.12+
Reviewed-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Sam Ravnborg <[email protected]>
Reviewed-by: Daniel Thompson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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