branch: die on config error when editing branch description

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/branch.c b/builtin/branch.c
index 0978287..c043cfc 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -570,7 +570,6 @@
 
 static int edit_branch_description(const char *branch_name)
 {
-	int status;
 	struct strbuf buf = STRBUF_INIT;
 	struct strbuf name = STRBUF_INIT;
 
@@ -595,11 +594,11 @@
 	strbuf_stripspace(&buf, 1);
 
 	strbuf_addf(&name, "branch.%s.description", branch_name);
-	status = git_config_set(name.buf, buf.len ? buf.buf : NULL);
+	git_config_set_or_die(name.buf, buf.len ? buf.buf : NULL);
 	strbuf_release(&name);
 	strbuf_release(&buf);
 
-	return status;
+	return 0;
 }
 
 int cmd_branch(int argc, const char **argv, const char *prefix)