The code was reading a HASH or DYNAMIC_ARRAY which may be uninited (difference from 5.0
is that those vars were always zeroed in 5.0 because were static globals, while they are new'd in 5.1).


sql/rpl_filter.cc:
  the hash or dynamic_array may not be inited, depends on a bool (e.g. if wild_do_table_inited==0
  wild_do_table is uninitialized memory); the code was not taking the bool into account and so reading uninited memory.
sql/rpl_filter.h:
  comments and prototype change (see rpl_filter.cc)