mysql-test/r/sp.result:
  New test case for BUG#6022.
mysql-test/t/sp.test:
  New test case for BUG#6022.
sql/sp_rcontext.cc:
  Find the most specific condition handler, not just the first one.
  (And corrected the return type for find_handler)
sql/sp_rcontext.h:
  Corrected return type for find_handler.