Fixed compiler warnings
Fix core dump when sending SIGHUP to mysqld


mysql-test/r/drop_temp_table.result:
  After merge fixes
mysql-test/r/grant.result:
  After merge fixes
mysql-test/r/group_min_max.result:
  After merge fixes
mysql-test/r/innodb.result:
  After merge fixes
mysql-test/r/insert_select.result:
  After merge fixes
mysql-test/r/rpl_charset.result:
  After merge fixes
mysql-test/r/rpl_create_database.result:
  After merge fixes
mysql-test/r/rpl_loaddata_rule_m.result:
  After merge fixes
mysql-test/t/rpl_charset.test:
  After merge fixes
mysql-test/t/rpl_create_database.test:
  After merge fixes
sql-common/client.c:
  After merge fixes
sql/item.cc:
  After merge fixes
sql/mysqld.cc:
  Fix core dump when sending SIGHUP to mysqld
sql/sql_acl.cc:
  Better comment
sql/sql_derived.cc:
  Fixed comment
  Added missing DBUG_RETURN
sql/sql_insert.cc:
  Fixed compiler warnings
  After merge fixes
sql/sql_lex.cc:
  After merge fixes
  Removed compiler warnings
sql/sql_parse.cc:
  After merge fixes
sql/sql_select.cc:
  More debugging
sql/sql_table.cc:
  Added missing DBUG_VOID_RETURN
sql/sql_update.cc:
  Fixed compiler warning
sql/sql_view.cc:
  Added missing DBUG_RETURN
  Fixed compiler warnings
  Added flag to signal that the view is a derived table