i3c: fix uninitialized variable use in i2c setup

Commit 31b9887c7258 ("i3c: remove i2c board info from i2c_dev_desc")
removed the boardinfo from i2c_dev_desc to decouple device enumeration from
setup but did not correctly lookup the i2c_dev_desc to store the new
device, instead dereferencing an uninitialized variable.

Lookup the device that has already been registered by address to store
the i2c client device.

Fixes: 31b9887c7258 ("i3c: remove i2c board info from i2c_dev_desc")
Reported-by: kernel test robot <[e-mail]>
Cc: Alexandre Belloni <[e-mail]>
Signed-off-by: Jamie Iles <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/i3c/master.c

···
 	 * We silently ignore failures here. The bus should keep working
 	 * correctly even if one or more i2c devices are not registered.
 	 */
-	list_for_each_entry(i2cboardinfo, &master->boardinfo.i2c, node)
+	list_for_each_entry(i2cboardinfo, &master->boardinfo.i2c, node) {
+		i2cdev = i3c_master_find_i2c_dev_by_addr(master,
+							 i2cboardinfo->base.addr);
+		if (WARN_ON(!i2cdev))
+			continue;
 		i2cdev->dev = i2c_new_client_device(adap, &i2cboardinfo->base);
+	}
 
 	return 0;
 }