vcd coverity whining

Signed-off-by: James Cherry <cherry@parallaxsw.com>

power/ReadVcdActivities.cc

@@ -78,6 +78,7 @@ ReadVcdActivities::ReadVcdActivities(const char *filename,
   filename_(filename),
   scope_(scope),
   vcd_(sta),
+  clk_period_(0.0),
   sta_(sta),
   power_(sta->power())
 {
@@ -141,6 +142,7 @@ ReadVcdActivities::setActivities()
             value_bit++;
           }
         }
+        stringDelete(bus_name);
       }
     }
   }

power/Vcd.cc

@@ -22,9 +22,11 @@ namespace sta {
 
 Vcd::Vcd(StaState *sta) :
   StaState(sta),
-  time_unit_scale_(0.0),
+  time_scale_(1.0),
+  time_unit_scale_(1.0),
   max_var_name_length_(0),
   max_var_width_(0),
+  min_delta_time_(0),
   time_max_(0)
 {
 }

power/VcdReader.cc

@@ -120,6 +120,7 @@ VcdReader::read(const char *filename)
 
 VcdReader::VcdReader(StaState *sta) :
   StaState(sta),
+  file_line_(0),
   stmt_line_(0),
   vcd_(nullptr),
   time_(0),