coverity#1257111 Uninitialized pointer field

Change-Id: I82c771f0ca7d2593a6f34dd84689cf055f9cf3f3

sc/source/core/data/table3.cxx

@@ -868,6 +868,7 @@ class ListenerStartAction : public sc::ColumnSpanSet::ColumnAction
 
 public:
     ListenerStartAction( ScDocument& rDoc ) :
+        mpCol(0),
         mpPosSet(new sc::ColumnBlockPositionSet(rDoc)),
         maStartCxt(rDoc, mpPosSet),
         maEndCxt(rDoc, mpPosSet) {}