PCI: Converge return paths in __assign_resources_sorted()

All return paths want to free head list in __assign_resources_sorted(), so
add a label and use goto.

Link: https://lore.kernel.org/r/20241216175632.4175-13-ilpo.jarvinen@linux.intel.com


Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Xiaochun Lee <lixc17@lenovo.com>