[POWERPC] 4xx: balance ioremap/ioumap calls for Yucca

Call iounmap before returning from an error case.
Signed-off-by: NRoel Kluin <12o3l@tiscali.nl>
Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>

arch/ppc/platforms/4xx/yucca.c

@@ -211,6 +211,7 @@ static void __init yucca_setup_pcie_fpga_rootpoint(int port)
 		break;
 
 	default:
+		iounmap(pcie_reg_fpga_base);
 		return;
 	}