bnxt_en: Remove the -1 error return code from bnxt_hwrm_do_send_msg().
Replace the non-standard -1 code with -EBUSY when there is no firmware response after waiting for the maximum timeout. Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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