remove double free (David Swasey)

src/cmd/vbackup/vnfs.c

diff --git a/src/cmd/vbackup/vnfs.c b/src/cmd/vbackup/vnfs.c
index 047d337..2776fd6 100644
--- a/src/cmd/vbackup/vnfs.c
+++ b/src/cmd/vbackup/vnfs.c
@@ -664,10 +664,8 @@
 	}
 	c.mtime = dir->mtime;
 	free(dir);
-	if((b = Bopen(name, OREAD)) == nil){
-		free(dir);
+	if((b = Bopen(name, OREAD)) == nil)
 		return -1;
-	}
 	
 	/*
 	 * Reuse old tree, garbage collecting entries that