Ensure all C++ class member raw pointers are default-initialized to nullptr.

libgnucash/backend/dbi/gnc-dbisqlconnection.cpp

@@ -53,7 +53,7 @@ public:
     void add_where_cond(QofIdTypeConst, const PairVec&) override;
 
 private:
-    const GncSqlConnection* m_conn;
+    const GncSqlConnection* m_conn = nullptr;
     std::string m_sql;
 };
 

libgnucash/backend/dbi/gnc-dbisqlconnection.hpp

@@ -86,7 +86,7 @@ public:
                                 const ColVec& info_vec) const noexcept;
     bool drop_indexes() noexcept;
 private:
-    QofBackend* m_qbe;
+    QofBackend* m_qbe = nullptr;
     dbi_conn m_conn;
     std::unique_ptr<GncDbiProvider> m_provider;
     /** Used by the error handler routines to flag if the connection is ok to

libgnucash/backend/dbi/gnc-dbisqlresult.hpp

@@ -63,11 +63,11 @@ protected:
             return dbi_result_field_is_null(m_inst->m_dbi_result, col);
         }
     private:
-        GncDbiSqlResult* m_inst;
+        GncDbiSqlResult* m_inst = nullptr;
     };
 
 private:
-    const GncDbiSqlConnection* m_conn;
+    const GncDbiSqlConnection* m_conn = nullptr;
     dbi_result m_dbi_result;
     IteratorImpl m_iter;
     GncSqlRow m_row;