Field_date::store function'. Though the Field_date::store function almost unused
when protocol_version=10 additional check was added into it to store 4byte dates 
properly. Effective test routine is not available so far due to protocol_version
is not a dynamic property and can not be modified with mysql-test script.


sql/field.cc:
  Fixes bug #15634. Eliminates compiler warning 'all return paths are recursive in 
  Field_date::store function'. Though the Field_date::store function almost unused
  when protocol_version=10 additional check was added into it to store 4byte dates 
  properly.