HID: i2c-hid: Use devm to allocate i2c_hid struct

Use devm here to save some lines and prepare for bulk regulator usage in
this driver. Otherwise, when we devm bulk get regulators we'll free the
containing i2c_hid structure and try to put regulator pointers from
freed memory.

Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Dmitry Torokhov <dtor@chromium.org>
Cc: Doug Anderson <dianders@chromium.org>
Signed-off-by: NStephen Boyd <swboyd@chromium.org>
Acked-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/i2c-hid/i2c-hid.c

@@ -1002,18 +1002,18 @@ static int i2c_hid_probe(struct i2c_client *client,
 		return client->irq;
 	}
 
-	ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL);
+	ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
 	if (!ihid)
 		return -ENOMEM;
 
 	if (client->dev.of_node) {
 		ret = i2c_hid_of_probe(client, &ihid->pdata);
 		if (ret)
-			goto err;
+			return ret;
 	} else if (!platform_data) {
 		ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
 		if (ret)
-			goto err;
+			return ret;
 	} else {
 		ihid->pdata = *platform_data;
 	}
@@ -1126,7 +1126,6 @@ static int i2c_hid_probe(struct i2c_client *client,
 
 err:
 	i2c_hid_free_buffers(ihid);
-	kfree(ihid);
 	return ret;
 }
 
@@ -1150,8 +1149,6 @@ static int i2c_hid_remove(struct i2c_client *client)
 
 	regulator_disable(ihid->pdata.supply);
 
-	kfree(ihid);
-
 	return 0;
 }