x86/pci: fix warnings in subsys_initcall functions

Signed-off-by: NRobert Richter <robert.richter@amd.com>
Cc: Robert Richter <robert.richter@amd.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/pci/legacy.c

@@ -66,5 +66,7 @@ int __init pci_subsys_init(void)
 	pci_numa_init();
 #endif
 	pcibios_init();
+
+	return 0;
 }
 subsys_initcall(pci_subsys_init);