drm/bridge: analogix-anx78xx: Remove duplicate NULL check

Since i2c_unregister_device() became NULL-aware we may remove duplicate
NULL check.

Cc: Archit Taneja <[e-mail]>
Cc: Andrzej Hajda <[e-mail]>
Cc: Laurent Pinchart <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: [e-mail]
Signed-off-by: Andy Shevchenko <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Ville Syrjälä <[e-mail]>

drivers/gpu/drm/bridge/analogix-anx78xx.c

···
 	unsigned int i;
 
 	for (i = 0; i < ARRAY_SIZE(anx78xx->i2c_dummy); i++)
-		if (anx78xx->i2c_dummy[i])
-			i2c_unregister_device(anx78xx->i2c_dummy[i]);
+		i2c_unregister_device(anx78xx->i2c_dummy[i]);
 }
 
 static const struct regmap_config anx78xx_regmap_config = {