i2c: i2c-mux-pca954x: fix deselect enabling for device-tree

Deselect functionality can be ignored for device-trees with
"i2c-mux-idle-disconnect" entries if no platform_data is available.
By enabling the deselect functionality outside the platform_data
block the logic works as it did in previous kernels.

Fixes: 7fcac98 ("i2c: i2c-mux-pca954x: convert to use an explicit i2c mux core")
Cc: <stable@vger.kernel.org> # v4.7+
Signed-off-by: Alex Hemme <ahemme@cisco.com>
Signed-off-by: Ziyang Wu <ziywu@cisco.com>
[touched up a few minor issues /peda]
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Author: Alex Hemme

drivers/i2c/muxes/i2c-mux-pca954x.c

@@ -268,9 +268,9 @@ static int pca954x_probe(struct i2c_client *client,
 				/* discard unconfigured channels */
 				break;
 			idle_disconnect_pd = pdata->modes[num].deselect_on_exit;
-			data->deselect |= (idle_disconnect_pd
-					   || idle_disconnect_dt) << num;
 		}
+		data->deselect |= (idle_disconnect_pd ||
+				   idle_disconnect_dt) << num;
 
 		ret = i2c_mux_add_adapter(muxc, force, num, class);