media: saa7146: add cleanup in hexium_attach()

If saa7146_register_device() fails, no cleanup is executed, leading to
memory/resource leaks. To fix this issue, perform necessary cleanup work
before returning the error.
Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/pci/saa7146/hexium_gemini.c

@@ -292,6 +292,9 @@ static int hexium_attach(struct saa7146_dev *dev, struct saa7146_pci_extension_d
 	ret = saa7146_register_device(&hexium->video_dev, dev, "hexium gemini", VFL_TYPE_GRABBER);
 	if (ret < 0) {
 		pr_err("cannot register capture v4l2 device. skipping.\n");
+		saa7146_vv_release(dev);
+		i2c_del_adapter(&hexium->i2c_adapter);
+		kfree(hexium);
 		return ret;
 	}