libflashrom: Add missing line ending when listing programmers

Change-Id: I4e570498afdee90c8f218022576c88eb8def2484
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72980
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
diff --git a/libflashrom.c b/libflashrom.c
index 5c574fa..3408faf 100644
--- a/libflashrom.c
+++ b/libflashrom.c
@@ -140,6 +140,7 @@
 	if (prog >= programmer_table_size) {
 		msg_ginfo("Error: Unknown programmer \"%s\". Valid choices are:\n", prog_name);
 		list_programmers_linebreak(0, 80, 0);
+		msg_ginfo(".\n");
 		return 1;
 	}
 	return programmer_init(programmer_table[prog], prog_param);