Fix two Valgrind memory leak warnings.

client/mysqlbinlog.cc:
  Now my_end() deallocates DBUG by default, but that fails in mysqlbinlog
  because of global destructors that use DBUG.
dbug/dbug.c:
  Add a facility to deallocate the debug stack, to avoid memory leak warnings
  in Valgrind.
include/my_dbug.h:
  Add a facility to deallocate the debug stack, to avoid memory leak warnings
  in Valgrind.
include/my_sys.h:
  Change my_end() to deallocate DBUG memory by default (can be disabled with
  MY_DONT_FREE_DBUG option).
libmysql/libmysql.c:
  Do not deallocate DBUG during cleanup.
mysys/my_init.c:
  Change my_end() to deallocate DBUG memory by default (can be disabled with
  MY_DONT_FREE_DBUG option).
sql/mysqld.cc:
  Add missing my_thread_end() call, seems to occasionally trigger a memory
  leak (not repeatable).

1 files changed, 4 insertions, 2 deletions

diff --git a/client/mysqlbinlog.cc b/client/mysqlbinlog.cc
index b1a931a9df1..60b54a2ed99 100644
--- a/client/mysqlbinlog.cc
+++ b/client/mysqlbinlog.cc
@@ -788,7 +788,8 @@ static void die(const char* fmt, ...)
   fprintf(stderr, "\n");
   va_end(args);
   cleanup();
-  my_end(0);
+  /* We cannot free DBUG, it is used in global destructors after exit(). */
+  my_end(MY_DONT_FREE_DBUG);
   exit(1);
 }
 
@@ -1460,7 +1461,8 @@ int main(int argc, char** argv)
   cleanup();
   free_defaults(defaults_argv);
   my_free_open_file_info();
-  my_end(0);
+  /* We cannot free DBUG, it is used in global destructors after exit(). */
+  my_end(MY_DONT_FREE_DBUG);
   exit(exit_value);
   DBUG_RETURN(exit_value);			// Keep compilers happy
 }