Fixed errors reported by valgrind (some errors in NDB remains)


myisam/rt_split.c:
  Added missing cast that caused problem on novell
  (minor code cleanup)
ndb/src/ndbapi/Ndb.cpp:
  Moved DBUG_ENTER to remove warning from DBUG library
sql/field_conv.cc:
  Added test for valgrind/purify to avoid warning
sql/item_sum.cc:
  Removed comment and added ASSERT as setup can't be called twice anymore
sql/sql_delete.cc:
  Fixed wrong return value
sql/sql_parse.cc:
  More debugging
sql/sql_select.cc:
  Removed duplicate call to setup() which caused a memory leak
strings/my_vsnprintf.c:
  Added support for '%c' (used when printing my_getopt errors)