net/mlxfw: Verify FSM error code translation doesn't exceed array size

Array mlxfw_fsm_state_err_str contains value to string translation, when
values are provided by mlxfw_dev. If value is larger than
MLXFW_FSM_STATE_ERR_MAX, return "unknown error" as expected instead of
reading an address than exceed array size.

Fixes: 410ed13cae ("Add the mlxfw module for Mellanox firmware flash process")
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlxfw/mlxfw_fsm.c

@@ -66,6 +66,8 @@ retry:
 		return err;
 
 	if (fsm_state_err != MLXFW_FSM_STATE_ERR_OK) {
+		fsm_state_err = min_t(enum mlxfw_fsm_state_err,
+				      fsm_state_err, MLXFW_FSM_STATE_ERR_MAX);
 		pr_err("Firmware flash failed: %s\n",
 		       mlxfw_fsm_state_err_str[fsm_state_err]);
 		NL_SET_ERR_MSG_MOD(extack, "Firmware flash failed");