Warn on signal handler addition failure

Author: cgzones

src/netlog/netlog-manager.c

@@ -668,8 +668,12 @@ int manager_new(const char *state_file, const char *cursor, Manager **ret) {
                 return log_error_errno(r, "Failed to allocate event loop: %m");
 
         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
-        (void) sd_event_add_signal(m->event, NULL, SIGTERM, manager_signal_event_handler, m);
-        (void) sd_event_add_signal(m->event, NULL, SIGINT, manager_signal_event_handler, m);
+        r = sd_event_add_signal(m->event, NULL, SIGTERM, manager_signal_event_handler, m);
+        if (r < 0)
+                log_warning_errno(r, "Failed to add SIGTERM event handler: %m");
+        r = sd_event_add_signal(m->event, NULL, SIGINT, manager_signal_event_handler, m);
+        if (r < 0)
+                log_warning_errno(r, "Failed to add SIGTERM event handler: %m");
 
         sd_event_set_watchdog(m->event, true);