Fix is_duplicate_packet() bug for fragmentation number setting.

Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c
index 8f7e9ac..93ed871 100644
--- a/drivers/net/wireless/ipw2200.c
+++ b/drivers/net/wireless/ipw2200.c
@@ -7754,10 +7754,10 @@
 		if (*last_frag + 1 != frag)
 			/* out-of-order fragment */
 			goto drop;
-		*last_frag = frag;
 	} else
 		*last_seq = seq;
 
+	*last_frag = frag;
 	*last_time = jiffies;
 	return 0;