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

Signed-off-by: David Woodhouse <[e-mail]>

fs/jffs2/nodelist.c

···
 		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