Zero initialize member variables

The default constructor on this class does not zero initialize the
variables, so add explicit zero initialization.

Change-Id: Id0c1348ef6e17f974c900924fd7453aad51b5c15
Signed-off-by: Ed Tanous <edtanous@google.com>
diff --git a/snmp_notification.hpp b/snmp_notification.hpp
index ca6eb9a..22a7fb3 100644
--- a/snmp_notification.hpp
+++ b/snmp_notification.hpp
@@ -148,9 +148,9 @@
 class OBMCErrorNotification : public Notification
 {
   private:
-    uint32_t OBMCErrorID;
-    uint64_t OBMCErrorTimestamp;
-    int32_t OBMCErrorSeverity;
+    uint32_t OBMCErrorID = 0;
+    uint64_t OBMCErrorTimestamp = 0;
+    int32_t OBMCErrorSeverity = 0;
     std::string OBMCErrorMessage;
 
   public: