A valid bridge is already found in lcdif_attach_bridge() and set
to lcdif->bridge, so lcdif->bridge cannot be a NULL pointer. Drop
the unnecessary NULL pointer check in KMS stage.
Tested-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
Reviewed-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
Signed-off-by: Liu Ying <victor.liu@xxxxxxx>