Parameter "cmdline" has no use, drop it.

Link: https://lkml.kernel.org/r/20210311085213.27680-1-jojing64@gmail.comAcked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Cao jin <jojing64@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>