net/mlx4_core: Avoid failing the interrupts test

Test interrupts fails if not all completion vectors called
request_irq. This case happens if only mlx4_en is loaded and
we have more completion vectors than rx rings.

Fixes: c66fa19c405a ('net/mlx4: Add EQ pool')
Signed-off-by: Carol L Soto <clsoto@linux.vnet.ibm.com>
Acked-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/eq.c

@@ -1364,6 +1364,10 @@ int mlx4_test_interrupts(struct mlx4_dev *dev)
 	 * and performing a NOP command
 	 */
 	for(i = 0; !err && (i < dev->caps.num_comp_vectors); ++i) {
+		/* Make sure request_irq was called */
+		if (!priv->eq_table.eq[i].have_irq)
+			continue;
+
 		/* Temporary use polling for command completions */
 		mlx4_cmd_use_polling(dev);