MetadataLookup: fix Coverity ID 700886, 700885 Uninitialized scalar f…

…ield

MetadataLookup::MetadataLookup(): Several scalar fields are not initialized by
the constructors.

mythtv/libs/libmythmetadata/metadatacommon.cpp

@@ -267,8 +267,11 @@ MetadataLookup::MetadataLookup(
     m_title(title),
     m_categories(categories),
     m_userrating(userrating),
+    m_ratingcount(0),
     m_subtitle(subtitle),
     m_description(description),
+    m_season(0),
+    m_episode(0),
     m_chanid(chanid),
     m_channum(channum),
     m_chansign(chansign),
@@ -345,12 +348,22 @@ MetadataLookup::MetadataLookup(
     m_title(title),
     m_categories(categories),
     m_userrating(userrating),
+    m_ratingcount(0),
     m_subtitle(subtitle),
     m_tagline(tagline),
     m_description(description),
     m_season(season),
     m_episode(episode),
+    m_chanid(0),
+    m_programflags(0),
+    m_audioproperties(0),
+    m_videoproperties(0),
+    m_subtitletype(0),
     m_certification(certification),
+    m_popularity(0),
+    m_budget(0),
+    m_revenue(0),
+    m_tracknum(0),
     m_year(year),
     m_releasedate(releasedate),
     m_runtime(runtime),