V4L/DVB (11568): cx18: Fix the handling of i2c bus registration error

* Return actual error values as returned by the i2c subsystem, rather
  than 0 or 1.
* If the registration of the second bus fails, unregister the first one
  before exiting, otherwise we are leaking resources.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Acked-by: NAndy Walls <awalls@radix.net>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-i2c.c

@@ -211,7 +211,7 @@ static struct i2c_algo_bit_data cx18_i2c_algo_template = {
 /* init + register i2c algo-bit adapter */
 int init_cx18_i2c(struct cx18 *cx)
 {
-	int i;
+	int i, err;
 	CX18_DEBUG_I2C("i2c init\n");
 
 	for (i = 0; i < 2; i++) {
@@ -268,8 +268,18 @@ int init_cx18_i2c(struct cx18 *cx)
 	cx18_call_hw(cx, CX18_HW_GPIO_RESET_CTRL,
 		     core, reset, (u32) CX18_GPIO_RESET_I2C);
 
-	return i2c_bit_add_bus(&cx->i2c_adap[0]) ||
-		i2c_bit_add_bus(&cx->i2c_adap[1]);
+	err = i2c_bit_add_bus(&cx->i2c_adap[0]);
+	if (err)
+		goto err;
+	err = i2c_bit_add_bus(&cx->i2c_adap[1]);
+	if (err)
+		goto err_del_bus_0;
+	return 0;
+
+ err_del_bus_0:
+	i2c_del_adapter(&cx->i2c_adap[0]);
+ err:
+	return err;
 }
 
 void exit_cx18_i2c(struct cx18 *cx)