merge with 3.23.51

BitKeeper/etc/ignore:
  auto-union
BitKeeper/etc/logging_ok:
  auto-union
BitKeeper/deleted/.del-mysql_fix_extensions.sh:
  Delete: scripts/mysql_fix_extensions.sh
Build-tools/Do-rpm:
  Auto merged
Makefile.am:
  Auto merged
client/mysqldump.c:
  Auto merged
client/mysqltest.c:
  Auto merged
extra/resolve_stack_dump.c:
  Auto merged
include/my_pthread.h:
  Auto merged
include/my_sys.h:
  Auto merged
include/mysqld_error.h:
  Auto merged
innobase/row/row0ins.c:
  Auto merged
innobase/row/row0mysql.c:
  Auto merged
innobase/row/row0sel.c:
  Auto merged
isam/pack_isam.c:
  Auto merged
libmysql/libmysql.c:
  Auto merged
mysql-test/r/func_if.result:
  Auto merged
mysql-test/t/join.test:
  Auto merged
mysys/array.c:
  Auto merged
mysys/charset.c:
  Auto merged
mysys/default.c:
  Auto merged
mysys/hash.c:
  Auto merged
mysys/my_thr_init.c:
  Auto merged
mysys/raid.cc:
  Auto merged
mysql-test/t/type_decimal.test:
  Auto merged
sql/hostname.cc:
  Auto merged
sql/item.h:
  Auto merged
sql/item_cmpfunc.h:
  Auto merged
sql/item_timefunc.h:
  Auto merged
sql/log.cc:
  Auto merged
sql/mini_client.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
strings/Makefile.am:
  Auto merged

sql/sql_db.cc

@@ -310,6 +310,7 @@ static long mysql_rm_known_files(THD *thd, MY_DIR *dirp, const char *db,
 #endif
     /* Remove last FN_LIBCHAR to not cause a problem on OS/2 */
     pos=strend(path);
+
     if (pos > path && pos[-1] == FN_LIBCHAR)
       *--pos=0;
     /* Don't give errors if we can't delete 'RAID' directory */