[JFFS2] Fix oops when marking space dirty in scan, but no previous node exists.

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Commit:     2ebf09c2491433a499e0ae7723d04e9e810afa84
Parent:     ddc58bd65ebe58c243e9f609384825df9ffd04ad
Author:     David Woodhouse <dwmw2 at infradead.org>
AuthorDate: Sun May 28 22:13:25 2006 +0100
Commit:     David Woodhouse <dwmw2 at infradead.org>
CommitDate: Sun May 28 22:13:25 2006 +0100

    [JFFS2] Fix oops when marking space dirty in scan, but no previous node exists.
    
    Signed-off-by: David Woodhouse <dwmw2 at infradead.org>

 fs/jffs2/nodelist.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c
index 5d36e9b..927dfe4 100644
--- a/fs/jffs2/nodelist.c
+++ b/fs/jffs2/nodelist.c
@@ -1139,7 +1139,7 @@ int jffs2_scan_dirty_space(struct jffs2_
 		BUG();
 	}
 	/* REF_EMPTY_NODE is !obsolete, so that works OK */
-	if (ref_obsolete(jeb->last_node)) {
+	if (jeb->last_node && ref_obsolete(jeb->last_node)) {
 #ifdef TEST_TOTLEN
 		jeb->last_node->__totlen += size;
 #endif