well enough

CREATE SERVER may cause server crash if there is not enough memory
to execute this operation.

Fixed that create_server() and prepare_server_struct_for_insert()
didn't check return value of functions that allocate memory.

As this is out of memory issue fix, not test case available.


sql/sql_servers.cc:
  Fixed that create_server() and prepare_server_struct_for_insert()
  didn't check return value of functions that allocate memory.