Correct memory leak fix


sql/unireg.h:
  Correct memory leak fix
sql/table.cc:
  Correct memory leak fix
sql/sql_view.h:
  Correct memory leak fix
sql/sql_view.cc:
  Correct memory leak fix
sql/sql_lex.h:
  Correct memory leak fix
sql/sql_base.cc:
  Correct memory leak fix