core/unit: check for correct function in vtable

Prompted by https://github.com/systemd/systemd/pull/30974/commits/61e44e01325eca50e88fc9cd400ee340081e9134

diff --git a/src/core/unit.c b/src/core/unit.c
index 011261a7fcaa92840785d1a7089ab7d2a9c8efc2..663e7e17379ddc1d9f2415d7b9d19e376f508aec 100644 (file)
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -6539,7 +6539,7 @@ int activation_details_append_pair(ActivationDetails *details, char ***strv) {
                         return r;
         }
 
-        if (ACTIVATION_DETAILS_VTABLE(details)->append_env) {
+        if (ACTIVATION_DETAILS_VTABLE(details)->append_pair) {
                 r = ACTIVATION_DETAILS_VTABLE(details)->append_pair(details, strv);
                 if (r < 0)
                         return r;