[PATCH] add-patch: response to unknown command

["Rubén Justo" <rjusto@gmail.com>]

In 26998ed2a2 (add-patch: response to unknown command, 2024-04-29) we
introduced an error message that displays the invalid command entered by
the user.

We process a line received from the user, but we only accept
single-character commands.

To avoid confusion, include in the error message only the first
character received.

Signed-off-by: Rubén Justo <rjusto@gmail.com>
---
 add-patch.c                | 4 ++--
 t/t3701-add-interactive.sh | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/add-patch.c b/add-patch.c
index 2252895c28..d408a85353 100644
--- a/add-patch.c
+++ b/add-patch.c
@@ -1692,8 +1692,8 @@ static int patch_update_file(struct add_p_state *s,
 						 "%.*s", (int)(eol - p), p);
 			}
 		} else {
-			err(s, _("Unknown command '%s' (use '?' for help)"),
-			    s->answer.buf);
+			err(s, _("Unknown command '%c' (use '?' for help)"),
+			    s->answer.buf[0]);
 		}
 	}
 
diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 28a95a775d..6f5d3085af 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -60,7 +60,7 @@ test_expect_success 'warn about add.interactive.useBuiltin' '
 
 test_expect_success 'unknown command' '
 	test_when_finished "git reset --hard; rm -f command" &&
-	echo W >command &&
+	echo WW >command &&
 	git add -N command &&
 	git diff command >expect &&
 	cat >>expect <<-EOF &&
-- 
2.45.1.217.gdb529f37a6