soc: sifive: ccache: fix missing iounmap() in error path in sifive_ccache_init()

Add missing iounmap() before return error from sifive_ccache_init().

Fixes: a967a289 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

drivers/soc/sifive/sifive_ccache.c

@@ -222,13 +222,16 @@ static int __init sifive_ccache_init(void)
 	if (!ccache_base)
 		return -ENOMEM;
 
-	if (of_property_read_u32(np, "cache-level", &level))
-		return -ENOENT;
+	if (of_property_read_u32(np, "cache-level", &level)) {
+		rc = -ENOENT;
+		goto err_unmap;
+	}
 
 	intr_num = of_property_count_u32_elems(np, "interrupts");
 	if (!intr_num) {
 		pr_err("No interrupts property\n");
-		return -ENODEV;
+		rc = -ENODEV;
+		goto err_unmap;
 	}
 
 	for (i = 0; i < intr_num; i++) {
@@ -237,7 +240,7 @@ static int __init sifive_ccache_init(void)
 				 NULL);
 		if (rc) {
 			pr_err("Could not request IRQ %d\n", g_irq[i]);
-			return rc;
+			goto err_unmap;
 		}
 	}
 
@@ -250,6 +253,10 @@ static int __init sifive_ccache_init(void)
 	setup_sifive_debug();
 #endif
 	return 0;
+
+err_unmap:
+	iounmap(ccache_base);
+	return rc;
 }
 
 device_initcall(sifive_ccache_init);