PCI ASPM: remove redundant list check

Remove the following check in __pcie_aspm_config_link() because it
nerver be true.
Acked-by: NShaohua Li <shaohua.li@intel.com>
Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/pcie/aspm.c

@@ -458,9 +458,6 @@ static void __pcie_aspm_config_link(struct pcie_link_state *link, u32 state)
 	struct pci_dev *child, *parent = link->pdev;
 	struct pci_bus *linkbus = parent->subordinate;
 
-	/* If no child, disable the link */
-	if (list_empty(&linkbus->devices))
-		state = 0;
 	/*
 	 * If the downstream component has pci bridge function, don't
 	 * do ASPM now.