powerpc/kexec: Use common error handling code in setup_new_fdt()

Add a jump target so that a bit of exception handling can be better
reused at the end of this function.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/machine_kexec_file_64.c

@@ -269,18 +269,14 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 		ret = fdt_setprop_u64(fdt, chosen_node,
 				      "linux,initrd-start",
 				      initrd_load_addr);
-		if (ret < 0) {
-			pr_err("Error setting up the new device tree.\n");
-			return -EINVAL;
-		}
+		if (ret < 0)
+			goto err;
 
 		/* initrd-end is the first address after the initrd image. */
 		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",
 				      initrd_load_addr + initrd_len);
-		if (ret < 0) {
-			pr_err("Error setting up the new device tree.\n");
-			return -EINVAL;
-		}
+		if (ret < 0)
+			goto err;
 
 		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
 		if (ret) {
@@ -292,10 +288,8 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 
 	if (cmdline != NULL) {
 		ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);
-		if (ret < 0) {
-			pr_err("Error setting up the new device tree.\n");
-			return -EINVAL;
-		}
+		if (ret < 0)
+			goto err;
 	} else {
 		ret = fdt_delprop(fdt, chosen_node, "bootargs");
 		if (ret && ret != -FDT_ERR_NOTFOUND) {
@@ -311,10 +305,12 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 	}
 
 	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
-	if (ret) {
-		pr_err("Error setting up the new device tree.\n");
-		return -EINVAL;
-	}
+	if (ret)
+		goto err;
 
 	return 0;
+
+err:
+	pr_err("Error setting up the new device tree.\n");
+	return -EINVAL;
 }