Fix coverity false positive.

eld_data would have been initialised in update_sad. In the other constructor, no field is ever accessed as the eld is marked as invalid.

So add default constructor to eld_data

mythtv/libs/libmyth/audio/eldutils.h

@@ -120,6 +120,7 @@ class MPUBLIC ELD
         int      spk_alloc;
         int      sad_count;
         struct cea_sad sad[ELD_MAX_SAD];
+        eld_data() { memset(this, 0, sizeof(*this)); }
     };
     eld_data m_e;
 };