dont always use default exception handler

src/ca/syncGroupWriteNotify.cpp

@@ -75,10 +75,8 @@ void syncGroupWriteNotify::completion ()
 void syncGroupWriteNotify::exception (
     int status, const char *pContext, unsigned type, arrayElementCount count )
 {
-    ca_signal_formated ( status, __FILE__, __LINE__, 
-            "CA sync group write request for channel \"%s\" failed because \"%s\" type=%s count=%u\n", 
-            this->chan->pName(), pContext, 
-            dbr_type_to_text ( static_cast < int > ( type ) ), count);
+   this->sg.exception ( status, pContext, 
+        __FILE__, __LINE__, *this->chan, type, count, CA_OP_PUT );
     //
     // This notify is left installed at this point as a place holder indicating that
     // all requests have not been completed. This notify is not uninstalled until