[PATCH 3/7] shortlog: extract `--group` fragment for translation

[Taylor Blau <me@ttaylorr.com>]

The subsequent commit will add another unhandled case in
`read_from_stdin()` which will want to use the same message as with
`--group=trailer`.

Extract the "--group=trailer" part from this message so the same
translation key can be used for both cases.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 builtin/shortlog.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin/shortlog.c b/builtin/shortlog.c
index 53c379a51d..051c97bd5a 100644
--- a/builtin/shortlog.c
+++ b/builtin/shortlog.c
@@ -132,7 +132,7 @@ static void read_from_stdin(struct shortlog *log)
 		match = committer_match;
 		break;
 	case SHORTLOG_GROUP_TRAILER:
-		die(_("using --group=trailer with stdin is not supported"));
+		die(_("using %s with stdin is not supported"), "--group=trailer");
 	default:
 		BUG("unhandled shortlog group");
 	}
-- 
2.37.0.1.g1379af2e9d