init: don't remove the /dev/ prefix from error messages

Remove the code that drops the /dev/ prefix from root_device_name, which
is only used for error messages when mounting the root device fails.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230531125535.676098-10-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

init/do_mounts.c

@@ -607,8 +607,6 @@ void __init mount_root(char *root_device_name)
  */
 void __init prepare_namespace(void)
 {
-	char *root_device_name;
-
 	if (root_delay) {
 		printk(KERN_INFO "Waiting %d sec before mounting root device...\n",
 		       root_delay);
@@ -627,19 +625,16 @@ void __init prepare_namespace(void)
 	md_run_setup();
 
 	if (saved_root_name[0]) {
-		root_device_name = saved_root_name;
-		if (!strncmp(root_device_name, "mtd", 3) ||
-		    !strncmp(root_device_name, "ubi", 3)) {
-			mount_root_generic(root_device_name, root_device_name,
+		if (!strncmp(saved_root_name, "mtd", 3) ||
+		    !strncmp(saved_root_name, "ubi", 3)) {
+			mount_root_generic(saved_root_name, saved_root_name,
 					   root_mountflags);
 			goto out;
 		}
-		ROOT_DEV = name_to_dev_t(root_device_name);
-		if (strncmp(root_device_name, "/dev/", 5) == 0)
-			root_device_name += 5;
+		ROOT_DEV = name_to_dev_t(saved_root_name);
 	}
 
-	if (initrd_load(root_device_name))
+	if (initrd_load(saved_root_name))
 		goto out;
 
 	/* wait for any asynchronous scanning to complete */
@@ -652,7 +647,7 @@ void __init prepare_namespace(void)
 		async_synchronize_full();
 	}
 
-	mount_root(root_device_name);
+	mount_root(saved_root_name);
 out:
 	devtmpfs_mount();
 	init_mount(".", "/", NULL, MS_MOVE, NULL);