ChangeLog, pass3.c, pass4.c, problem.c, problem.h, super.c:

ChangeLog, pass3.c, pass4.c, problem.c, problem.h, super.c:
  problem.c: Add PR_3_NO_DIRINFO error code.
  super.c (check_super_value): Rename min and max to min_val and max_val
  	to avoid possible cpp macro conflicts.
  pass4.c (e2fsck_pass4): Rename max to maxgroup, to avoid possible cpp
  	macro conflicts.
  pass3.c (e2fsck_pass3): Rename max to maxdirs, to avoid possible cpp
  	macro conflicts.
  	(check_directory): Fix logic to avoid possible core dump in the
  	case of ext2fs_get_dir_info returning NULL.  (By the time we get here,
  	it should never happen, but...).  Also simply/streamline the control
  	flow of the function.