very similar, now in walnut_setup_arch(); arch/ppc/platforms/4xx/walnut.c

index 2f97723..04d3f3f 100644
@@ -81,22 +81,23 @@ walnut_setup_arch(void)
 	kb_data = ioremap(WALNUT_PS2_BASE, 8);
 	if (!kb_data) {
 		printk(KERN_CRIT
 		       "walnut_setup_arch() kb_data ioremap failed\n");
 		return;
 	}
 
 	kb_cs = kb_data + 1;
 
 	fpga_status = ioremap(PPC40x_FPGA_BASE, 8);
 	if (!fpga_status) {
+		iounmap(kb_data);
 		printk(KERN_CRIT
 		       "walnut_setup_arch() fpga_status ioremap failed\n");
 		return;
 	}
 
 	fpga_enable = fpga_status + 1;
 	fpga_polarity = fpga_status + 2;
 	fpga_trigger = fpga_status + 3;
 	fpga_brdc = fpga_status + 4;
 
 	/* split the keyboard and mouse interrupts */