watchdog: don't hang on exit

src/helpers/Watchdog.cpp

@@ -3,6 +3,9 @@
 #include "config/ConfigManager.hpp"
 
 CWatchdog::~CWatchdog() {
+    m_bExitThread = true;
+    m_bNotified   = true;
+    m_cvWatchdogCondition.notify_all();
     m_pWatchdog.reset();
 }
 
@@ -22,6 +25,9 @@ CWatchdog::CWatchdog() {
                     pthread_kill(m_iMainThreadPID, SIGUSR1);
             }
 
+            if (m_bExitThread)
+                break;
+
             m_bWatching = false;
             m_bNotified = false;
         }