With semihosting_get_arg, we already have a check vs argc, so
there's no point replicating it -- just check the result vs NULL.
Merge copy_argn_to_target into its caller.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220628111701.677216-8-richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>