Merge pull request #15191 from GiedriusS/feature/list-unit-files-return-1

systemctl: exit with 1 if no unit files found

src/systemctl/systemctl.c

@@ -1659,6 +1659,9 @@ static int list_unit_files(int argc, char *argv[], void *userdata) {
                 for (unit = units; unit < units + c; unit++)
                         free(unit->path);
 
+        if (c == 0)
+                return -ENOENT;
+
         return 0;
 }