Re: [PATCH 3/3] diff --submodule=diff: Don't print failure message twice

> When we fail to start a diff command inside a submodule, immediately
> exit the routine rather than trying to finish the command and printing
> a second message.
>
> Signed-off-by: David Turner <dturner@twosigma.com>
> ---
>  submodule.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/submodule.c b/submodule.c
> index 9031527a16..0acfad3d4c 100644
> --- a/submodule.c
> +++ b/submodule.c
> @@ -713,8 +713,10 @@ void show_submodule_inline_diff(struct diff_options *o, const char *path,
>  		strvec_push(&cp.args, oid_to_hex(new_oid));
>  
>  	prepare_submodule_repo_env(&cp.env_array);
> -	if (start_command(&cp))
> +	if (start_command(&cp)) {
>  		diff_emit_submodule_error(o, "(diff failed)\n");
> +		goto done;
> +	}
>  
>  	while (strbuf_getwholeline_fd(&sb, cp.out, '\n') != EOF)
>  		diff_emit_submodule_pipethrough(o, sb.buf, sb.len);