Some code cleanup


mysql-test/r/sp.result:
  Update results after adding quotes around function/procedure names
sql/sp.cc:
  Moved DBUG_ENTER after all variable declarations
  Eliminated some variables.
  Added more DBUG_ENTER commands.
  Added memory allocation checking in create_string()
  Fixed memory leak in sp_show_create_function()
  Removed usage of sprintf
sql/sql_parse.cc:
  Simple cleanup
  Fixed memory leaks for mailformed SP definitions