MT#59962 AmEvent: explicit define for event `0`

`0` - means termination, so just use a define.

Change-Id: Ibe398d81ebfcc7e751c2eb8aad455d2739cf3fcb

core/AmEvent.h

@@ -33,6 +33,7 @@
 #include <string>
 using std::string;
 
+#define E_TERMINATE_LEG    0
 #define E_PLUGIN           100
 #define E_SYSTEM           101
 #define E_SIP_SUBSCRIPTION 102

core/AmRtpStream.h

@@ -97,7 +97,7 @@ class AmRtpTimeoutEvent
 	
 public:
   AmRtpTimeoutEvent() 
-    : AmEvent(0) { }
+    : AmEvent(E_TERMINATE_LEG) { }
   ~AmRtpTimeoutEvent() { }
 };
 

core/AmSession.cpp

@@ -539,7 +539,7 @@ void AmSession::setStopped(bool wakeup) {
     onStop();
   }
   if (wakeup)
-    AmSessionContainer::instance()->postEvent(getLocalTag(), new AmEvent(0));
+    AmSessionContainer::instance()->postEvent(getLocalTag(), new AmEvent(E_TERMINATE_LEG));
 }
 
 string AmSession::getAppParam(const string& param_name) const

core/ampi/DiameterClientAPI.h

@@ -51,7 +51,7 @@ struct DiameterReplyEvent
 
  DiameterReplyEvent(unsigned int commandCode, 
 		    unsigned int applicationId, AmArg avps)
-   : AmEvent(0), commandCode(commandCode), 
+   : AmEvent(E_TERMINATE_LEG), commandCode(commandCode),
     applicationId(applicationId), avps(avps)
   { }
 };