staging: ftbft: Use backlight helper

backlight_properties.fb_blank is deprecated. The states it represents
are handled by other properties; but instead of accessing those
properties directly, drivers should use the helpers provided by
backlight.h.

Instead of manually checking the power state in struct
backlight_properties, use backlight_is_blank().

Cc: Greg Kroah-Hartman <[email protected]>
Cc: "Noralf Trønnes" <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Javier Martinez Canillas <[email protected]>
Cc: Len Baker <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Daniel Thompson <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Stephen Kitt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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