tree-wide: drop redundant check for SD_VARLINK_METHOD_MORE flag

If the IDL declares the method requires 'more' yet the call doesn't
have it set, varlink_idl_validate_method_call() should have rejected
it and the callback shouldn't be reached.

src/bootctl/bootctl-status.c

@@ -642,14 +642,12 @@ int vl_method_list_boot_entries(sd_varlink *link, sd_json_variant *parameters, s
         int r;
 
         assert(link);
+        assert(FLAGS_SET(flags, SD_VARLINK_METHOD_MORE));
 
         r = sd_varlink_dispatch(link, parameters, /* dispatch_table= */ NULL, /* userdata= */ NULL);
         if (r != 0)
                 return r;
 
-        if (!FLAGS_SET(flags, SD_VARLINK_METHOD_MORE))
-                return sd_varlink_error(link, SD_VARLINK_ERROR_EXPECTED_MORE, NULL);
-
         r = acquire_esp(/* unprivileged_mode= */ false,
                         /* graceful= */ false,
                         /* ret_part= */ NULL,

src/import/importd.c

@@ -1793,14 +1793,12 @@ static int vl_method_list_transfers(sd_varlink *link, sd_json_variant *parameter
 
         assert(link);
         assert(parameters);
+        assert(FLAGS_SET(flags, SD_VARLINK_METHOD_MORE));
 
         r = sd_varlink_dispatch(link, parameters, dispatch_table, &p);
         if (r != 0)
                 return r;
 
-        if (!FLAGS_SET(flags, SD_VARLINK_METHOD_MORE))
-                return sd_varlink_error(link, SD_VARLINK_ERROR_EXPECTED_MORE, NULL);
-
         r = varlink_set_sentinel(link, "io.systemd.Import.NoTransfers");
         if (r < 0)
                 return r;

src/pcrlock/pcrlock.c

@@ -5404,6 +5404,7 @@ static int vl_method_read_event_log(sd_varlink *link, sd_json_variant *parameter
         int r;
 
         assert(link);
+        assert(FLAGS_SET(flags, SD_VARLINK_METHOD_MORE));
 
         r = sd_varlink_dispatch(link, parameters, /* dispatch_table= */ NULL, /* userdata= */ NULL);
         if (r != 0)

src/resolve/resolved-varlink.c

@@ -1239,9 +1239,7 @@ static int vl_method_subscribe_query_results(sd_varlink *link, sd_json_variant *
         Manager *m = ASSERT_PTR(sd_varlink_get_userdata(ASSERT_PTR(link)));
         int r;
 
-        /* if the client didn't set the more flag, it is using us incorrectly */
+        assert(FLAGS_SET(flags, SD_VARLINK_METHOD_MORE));
-        if (!FLAGS_SET(flags, SD_VARLINK_METHOD_MORE))
-                return sd_varlink_error(link, SD_VARLINK_ERROR_EXPECTED_MORE, NULL);
 
         r = verify_polkit(link, parameters, "org.freedesktop.resolve1.subscribe-query-results");
         if (r <= 0)
@@ -1382,9 +1380,7 @@ static int vl_method_subscribe_dns_configuration(sd_varlink *link, sd_json_varia
         Manager *m = ASSERT_PTR(sd_varlink_get_userdata(ASSERT_PTR(link)));
         int r;
 
-        /* if the client didn't set the more flag, it is using us incorrectly */
+        assert(FLAGS_SET(flags, SD_VARLINK_METHOD_MORE));
-        if (!FLAGS_SET(flags, SD_VARLINK_METHOD_MORE))
-                return sd_varlink_error(link, SD_VARLINK_ERROR_EXPECTED_MORE, NULL);
 
         r = verify_polkit(link, parameters, "org.freedesktop.resolve1.subscribe-dns-configuration");
         if (r <= 0)

src/shared/metrics.c

@@ -84,14 +84,12 @@ int metrics_method_describe(
         assert(metric_family_table);
         assert(link);
         assert(parameters);
+        assert(FLAGS_SET(flags, SD_VARLINK_METHOD_MORE));
 
         r = sd_varlink_dispatch(link, parameters, /* dispatch_table= */ NULL, /* userdata= */ NULL);
         if (r != 0)
                 return r;
 
-        if (!FLAGS_SET(flags, SD_VARLINK_METHOD_MORE))
-                return sd_varlink_error(link, SD_VARLINK_ERROR_EXPECTED_MORE, NULL);
-
         r = varlink_set_sentinel(link, "io.systemd.Metrics.NoSuchMetric");
         if (r < 0)
                 return r;
@@ -123,14 +121,12 @@ int metrics_method_list(
         assert(metric_family_table);
         assert(link);
         assert(parameters);
+        assert(FLAGS_SET(flags, SD_VARLINK_METHOD_MORE));
 
         r = sd_varlink_dispatch(link, parameters, /* dispatch_table= */ NULL, /* userdata= */ NULL);
         if (r != 0)
                 return r;
 
-        if (!FLAGS_SET(flags, SD_VARLINK_METHOD_MORE))
-                return sd_varlink_error(link, SD_VARLINK_ERROR_EXPECTED_MORE, NULL);
-
         r = varlink_set_sentinel(link, "io.systemd.Metrics.NoSuchMetric");
         if (r < 0)
                 return r;

src/sysext/sysext.c

@@ -2749,6 +2749,7 @@ static int vl_method_list(sd_varlink *link, sd_json_variant *parameters, sd_varl
         int r;
 
         assert(link);
+        assert(FLAGS_SET(flags, SD_VARLINK_METHOD_MORE));
 
         const char *class = NULL;
         r = sd_varlink_dispatch(link, parameters, dispatch_table, &class);