keep vio from being freed twice when we are low on memory
mysys/safemalloc.c
    changes for --safemalloc-mem-limit
sql/mini_client.cc
    keep vio from being freed twice
sql/mysqld.cc
    changes for --safemalloc-mem-limit
sql/slave.cc
    prevent closing connection twice
sql/sql_string.h
    shrink() did not work right when my_realloc() failed


BitKeeper/etc/ignore:
  Added .gdb_history to the ignore list
libmysql/libmysql.c:
  keep vio from being freed twice when we are low on memory
mysys/safemalloc.c:
  changes for --safemalloc-mem-limit
sql/mini_client.cc:
  keep vio from being freed twice
sql/mysqld.cc:
  changes for --safemalloc-mem-limit
sql/slave.cc:
  prevent closing connection twice
sql/sql_string.h:
  shrink() did not work right when my_realloc() failed