Fixes:
- Bug #25596: 


innobase/dict/dict0dict.c:
  Applied innodb-5.0-ss1230 snapshot.
  
  r1230
  
  branches/5.0: ib_isspace(c): Check for c being the null character.
  (Bug #25596)
sql/ha_innodb.h:
  Applied innodb-5.0-ss1230
  
  Trivial indent SPACES -> TAB change.