PCI: generic: fix missing call of pci_free_resource_list()

Call pci_free_resource_list() from pci_host_common_probe() when probing
fails, as done inside gen_pci_init() when this later function fails.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>