is a special case in "SHOW PROFILE FOR QUERY n".  No one can get
the zero item (which is always the statement that turns on profiling),
because zero represents the final item, internally.

Now, order the queries starting at one.


mysql-test/r/profiling.result:
  Renumber the query IDs.
sql/sql_profile.cc:
  Start the profile_id_counter at 1, to overstep the special-case 
  value of zero.
  
  Unrelated, but looks similar: don't use -1 to initialize an unsigned 
  integer field.  That causes warnings in some environments.