arch/powerpc/sysdev/fsl_pci.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: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/sysdev/fsl_pci.c

@@ -205,12 +205,12 @@ static void __init setup_pci_atmu(struct pci_controller *hose,
 
 	if (paddr_hi == paddr_lo) {
 		pr_err("%s: No outbound window space\n", name);
-		return ;
+		goto out;
 	}
 
 	if (paddr_lo == 0) {
 		pr_err("%s: No space for inbound window\n", name);
-		return ;
+		goto out;
 	}
 
 	/* setup PCSRBAR/PEXCSRBAR */
@@ -357,6 +357,7 @@ static void __init setup_pci_atmu(struct pci_controller *hose,
 			(u64)hose->dma_window_size);
 	}
 
+out:
 	iounmap(pci);
 }