BUG#44378 rpl_binlog_corruption fails with warning messages in Valgrind

      
The rpl_binlog_corruption test case was inject failures, specifically,
incidents with invalid numbers to see if the replication was failing
gracefully. However, this test was causing the following warning message
in Valgrind: "Conditional jump or move depends on uninitialised value(s)"
      
The patch fixes the problem by correctly initializing the m_inicident 
number.

sql/log_event.cc

@@ -9250,7 +9250,7 @@ Incident_log_event::Incident_log_event(const char *buf, uint event_len,
     // If the incident is not recognized, this binlog event is
     // invalid.  If we set incident_number to INCIDENT_NONE, the
     // invalidity will be detected by is_valid().
-    incident_number= INCIDENT_NONE;
+    m_incident= INCIDENT_NONE;
     DBUG_VOID_RETURN;
   }
   m_incident= static_cast<Incident>(incident_number);