PCI: drivers/pci/hotplug/ibmphp_ebda.c: add missing iounmap

Add missing iounmap in error handling code, in a case where the function
already preforms iounmap on some other execution path.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e;
statement S,S1;
int ret;
@@
e = \(ioremap\|ioremap_nocache\)(...)
... when != iounmap(e)
if (<+...e...+>) S
... when any
    when != iounmap(e)
*if (...)
   { ... when != iounmap(e)
     return ...; }
... when any
iounmap(e);
// </smpl>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/hotplug/ibmphp_ebda.c

@@ -368,8 +368,10 @@ int __init ibmphp_access_ebda (void)
 			debug ("rio blk id: %x\n", blk_id);
 
 			rio_table_ptr = kzalloc(sizeof(struct rio_table_hdr), GFP_KERNEL);
-			if (!rio_table_ptr)
-				return -ENOMEM; 
+			if (!rio_table_ptr) {
+				rc = -ENOMEM;
+				goto out;
+			}
 			rio_table_ptr->ver_num = readb (io_mem + offset);
 			rio_table_ptr->scal_count = readb (io_mem + offset + 1);
 			rio_table_ptr->riodev_count = readb (io_mem + offset + 2);