tracepointgen: Fix double comma in enums

Remove commas at the end of the lines.

Pick-to: 6.5
Change-Id: Idf731ac5de64787276c1fdf798eb429b8f73213b
Reviewed-by: Janne Koskinen <janne.p.koskinen@qt.io>
Reviewed-by: Antti Määttä <antti.maatta@qt.io>

src/tools/tracepointgen/parser.cpp

@@ -353,6 +353,10 @@ static QList<EnumNameValue> enumsToValues(const QStringList &values)
                 }
             }
         } else {
+            if (value.endsWith(QLatin1Char(',')))
+                r.name = value.left(value.length() - 1);
+            else
+                r.name = value;
             r.value = ++cur;
             ret << r;
         }