Fix compile failure in arch/powerpc/kernel/pci-common.c

This fixes the fallout from the recent powerpc merge (commit
489de30259e667d7bc47da9da44a0270b050cd97):

   CC      arch/powerpc/kernel/pci-common.o
  arch/powerpc/kernel/pci-common.c:160: error: conflicting types for 'pcibios_add_platform_entries'
  include/linux/pci.h:889: error: previous declaration of 'pcibios_add_platform_entries' was here

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Tested-by: Bret Towe <magnade@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/powerpc/kernel/pci-common.c

@@ -156,11 +156,14 @@ static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
 #endif /* CONFIG_PPC_OF */
 
 /* Add sysfs properties */
-void pcibios_add_platform_entries(struct pci_dev *pdev)
+int pcibios_add_platform_entries(struct pci_dev *pdev)
 {
 #ifdef CONFIG_PPC_OF
-	device_create_file(&pdev->dev, &dev_attr_devspec);
+	return device_create_file(&pdev->dev, &dev_attr_devspec);
+#else
+	return 0;
 #endif /* CONFIG_PPC_OF */
+
 }
 
 char __init *pcibios_setup(char *str)