Fixed findings

List of Findings

Error: COMPILER_WARNING: [#def1]
libdb-5.3.28-build/db-5.3.28/db_converter-1.0.2/convert.cc: scope_hint: In function ‘int main(int, char**)’
libdb-5.3.28-build/db-5.3.28/db_converter-1.0.2/convert.cc:69:9: warning[-Wdelete-non-virtual-dtor]: deleting object of polymorphic class type ‘DB_’ which has non-virtual destructor might cause undefined behavior
#   69 |         delete x;
#      |         ^~~~~~~~
#   67|   	}
#   68|       	b->close_db();
#   69|-> 	delete x;
#   70|   	delete b;
#   71|   	return 0;

Error: COMPILER_WARNING: [#def2]
libdb-5.3.28-build/db-5.3.28/db_converter-1.0.2/convert.cc:70:9: warning[-Wdelete-non-virtual-dtor]: deleting object of polymorphic class type ‘DB_’ which has non-virtual destructor might cause undefined behavior
#   70 |         delete b;
#      |         ^~~~~~~~
#   68|       	b->close_db();
#   69|   	delete x;
#   70|-> 	delete b;
#   71|   	return 0;
#   72|   }

Error: CPPCHECK_WARNING (CWE-404): [#def3]
libdb-5.3.28-build/db-5.3.28/db_converter-1.0.2/convert_db.h:28: error[virtualDestructor]: Class 'DB_' which is inherited by class 'GDBM_' does not have a virtual destructor.
#   26|    * "Semi" Abstract class for database all database types
#   27|    */
#   28|-> class DB_ {
#   29|   	protected:
#   30|   		DB_type database_type;

Error: CPPCHECK_WARNING (CWE-404): [#def4]
libdb-5.3.28-build/db-5.3.28/db_converter-1.0.2/convert_db.h:28: error[virtualDestructor]: Class 'DB_' which is inherited by class 'LMDB_' does not have a virtual destructor.
#   26|    * "Semi" Abstract class for database all database types
#   27|    */
#   28|-> class DB_ {
#   29|   	protected:
#   30|   		DB_type database_type;

Error: CPPCHECK_WARNING (CWE-404): [#def5]
libdb-5.3.28-build/db-5.3.28/db_converter-1.0.2/convert_db.h:28: error[virtualDestructor]: Class 'DB_' which is inherited by class 'Libdb' does not have a virtual destructor.
#   26|    * "Semi" Abstract class for database all database types
#   27|    */
#   28|-> class DB_ {
#   29|   	protected:
#   30|   		DB_type database_type;

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