drivers/net: fix comparisons of unsigned < 0

Recent gcc versions emit warnings when unsigned variables are compared < 0 or >= 0.

Signed-off-by: Bill Nottingham <notting@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/mlx4/qp.c b/drivers/net/mlx4/qp.c
index 7f8b7d5..492cfaa 100644
--- a/drivers/net/mlx4/qp.c
+++ b/drivers/net/mlx4/qp.c
@@ -113,8 +113,7 @@
 	struct mlx4_cmd_mailbox *mailbox;
 	int ret = 0;
 
-	if (cur_state < 0 || cur_state >= MLX4_QP_NUM_STATE ||
-	    new_state < 0 || cur_state >= MLX4_QP_NUM_STATE ||
+	if (cur_state >= MLX4_QP_NUM_STATE || cur_state >= MLX4_QP_NUM_STATE ||
 	    !op[cur_state][new_state])
 		return -EINVAL;