init/main.c: Remove redundant space from saved_command_line

There is a space at the end of extra_init_args. In the current logic,
copying extra_init_args to saved_command_line will cause extra spaces
in saved_command_line here or there. Remove the trailing space from
extra_init_args to make the string in saved_command_line look more perfect.

Link: https://lore.kernel.org/all/20240412032950.12687-1-ytcoode@gmail.com/Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

init/main.c

@@ -628,8 +628,10 @@ static void __init setup_command_line(char *command_line)
 
 	if (extra_command_line)
 		xlen = strlen(extra_command_line);
-	if (extra_init_args)
+	if (extra_init_args) {
+		extra_init_args = strim(extra_init_args); /* remove trailing space */
 		ilen = strlen(extra_init_args) + 4; /* for " -- " */
+	}
 
 	len = xlen + strlen(boot_command_line) + 1;