lib: devres: add annotations for #endif

While working on devres, I found those make navigating the code a tad
easier.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

lib/devres.c

@@ -348,5 +348,5 @@ void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
 	}
 }
 EXPORT_SYMBOL(pcim_iounmap_regions);
-#endif
-#endif
+#endif /* CONFIG_PCI */
+#endif /* CONFIG_HAS_IOPORT */