bnxt_en: New Broadcom ethernet driver.

Hello Michael Chan,

The patch c0c050c58d84: "bnxt_en: New Broadcom ethernet driver." from Oct 22, 2015, leads to the following static checker warning:

	drivers/net/ethernet/broadcom/bnxt/bnxt.c:5337 bnxt_rx_flow_steer()
	warn: impossible condition '(new_fltr->sw_id < 0) => (0-65535 < 0)'

drivers/net/ethernet/broadcom/bnxt/bnxt.c
5335 new_fltr->sw_id = bitmap_find_free_region(bp->ntp_fltr_bmap,
5336 BNXT_NTP_FLTR_MAX_FLTR, 0);

  5337          if (new_fltr->sw_id < 0) {
                   ^^^^^^^^^^^^^^^^^^^^

Unsigned never less than zero.

  5338                  spin_unlock_bh(&bp->ntp_fltr_lock);
  5339                  rc = -ENOMEM;
  5340                  goto err_free;

5341 }

regards,
dan carpenter