kernel-install: exit with option --json=help (#39974)

In that case, `parse_json_argument()` returns 0.

Follow-up for bdd36c003d9c4c4ca89c92be504615378f61513c (v255).

diff --git a/src/kernel-install/kernel-install.c b/src/kernel-install/kernel-install.c
index 97c4b3a352bc271b599a7a57f207eb39f5f9de86..27cfa089089d903a54656464366ba5df575b52ba 100644 (file)
--- a/src/kernel-install/kernel-install.c
+++ b/src/kernel-install/kernel-install.c
@@ -1621,7 +1621,7 @@ static int parse_argv(int argc, char *argv[], Context *c) {
 
                 case ARG_JSON:
                         r = parse_json_argument(optarg, &arg_json_format_flags);
-                        if (r < 0)
+                        if (r <= 0)
                                 return r;
                         break;