[PATCH] null dereference in fs/jbd2/journal.c

This is Eric Sesterhenn's jbd patch applied to jbd2.
Commit: 41716c7c

His words:

Since commit d1807793 we dereference a NULL
pointer.  Coverity id #1432.  We set journal to NULL, and use it directly
afterwards.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Cc: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>