Revert "task_struct: make journal_info conditional"

This reverts commit e4c570c4cb, as
requested by Alexey:

 "I think I gave a good enough arguments to not merge it.
  To iterate:
   * patch makes impossible to start using ext3 on EXT3_FS=n kernels
     without reboot.
   * this is done only for one pointer on task_struct"

  None of config options which define task_struct are tristate directly
  or effectively."

Requested-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/sched.h

@@ -1446,10 +1446,8 @@ struct task_struct {
 	gfp_t lockdep_reclaim_gfp;
 #endif
 
-#ifdef CONFIG_FS_JOURNAL_INFO
 /* journalling filesystem info */
 	void *journal_info;
-#endif
 
 /* stacked block device info */
 	struct bio *bio_list, **bio_tail;