media: i2c: ov8865: remove unnecessary NULL check

The check on mode_index is sufficient to ensure that we have a
valid mode. Remove the explicit mode check similarly to
commit 38a5023 ("media: i2c: ov5648: remove unnecessary NULL check")

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ov8865.c

@@ -2689,7 +2689,7 @@ static int ov8865_enum_frame_interval(struct v4l2_subdev *subdev,
 		}
 	}
 
-	if (mode_index == ARRAY_SIZE(ov8865_modes) || !mode)
+	if (mode_index == ARRAY_SIZE(ov8865_modes))
 		return -EINVAL;
 
 	interval_enum->interval = mode->frame_interval;