init: move from strlcpy with unused retval to strscpy

Follow the advice of the below link and prefer 'strscpy' in this
subsystem.  Conversion is 1:1 because the return value is not used. 
Generated by a coccinelle script.

Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/
Link: https://lkml.kernel.org/r/20220818210200.8203-1-wsa+renesas@sang-engineering.comSigned-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

init/do_mounts.c

@@ -296,7 +296,7 @@ EXPORT_SYMBOL_GPL(name_to_dev_t);
 
 static int __init root_dev_setup(char *line)
 {
-	strlcpy(saved_root_name, line, sizeof(saved_root_name));
+	strscpy(saved_root_name, line, sizeof(saved_root_name));
 	return 1;
 }
 
@@ -343,7 +343,7 @@ static int __init split_fs_names(char *page, size_t size, char *names)
 	int count = 1;
 	char *p = page;
 
-	strlcpy(p, root_fs_names, size);
+	strscpy(p, root_fs_names, size);
 	while (*p++) {
 		if (p[-1] == ',') {
 			p[-1] = '\0';

init/main.c

@@ -422,7 +422,7 @@ static void __init setup_boot_config(void)
 	if (!data)
 		data = xbc_get_embedded_bootconfig(&size);
 
-	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+	strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 	err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
 			 bootconfig_params);
 
@@ -762,7 +762,7 @@ void __init parse_early_param(void)
 		return;
 
 	/* All fall through to do_early_param. */
-	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+	strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
 	parse_early_options(tmp_cmdline);
 	done = 1;
 }