misc: microchip: pci1xxxx: Fix a memory leak in the error handling of gp_aux_bus_probe()

'aux_bus' is freed in the remove function but not in the error handling
path of the probe.

Use devm_kzalloc() to simplify the remove function and fix the leak in the
probe.

Fixes: 393fc2f5948f ("misc: microchip: pci1xxxx: load auxiliary bus driver for the PIO function in the multi-function endpoint of pci1xxxx device.")
Signed-off-by: Christophe JAILLET <[e-mail]>
Link: https://lore.kernel.org/r/17e1992666[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gp.c

···
 	if (retval)
 		return retval;
 
-	aux_bus = kzalloc(sizeof(*aux_bus), GFP_KERNEL);
+	aux_bus = devm_kzalloc(&pdev->dev, sizeof(*aux_bus), GFP_KERNEL);
 	if (!aux_bus)
 		return -ENOMEM;
 
···
 	auxiliary_device_uninit(&aux_bus->aux_device_wrapper[0]->aux_dev);
 	auxiliary_device_delete(&aux_bus->aux_device_wrapper[1]->aux_dev);
 	auxiliary_device_uninit(&aux_bus->aux_device_wrapper[1]->aux_dev);
-	kfree(aux_bus);
 }
 
 static const struct pci_device_id pci1xxxx_tbl[] = {