ice: remove redundant max_vsi_num variable

It is a leftover from previous implementation. Accidentally it wasn't
removed. Do it now.

Commit that has removed it:
commit c1e5da5d ("ice: improve switchdev's slow-path")
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Reviewed-by: Piotr Raczynski <piotr.raczynski@intel.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_eswitch.c

@@ -224,7 +224,6 @@ ice_eswitch_release_reprs(struct ice_pf *pf, struct ice_vsi *ctrl_vsi)
 static int ice_eswitch_setup_reprs(struct ice_pf *pf)
 {
 	struct ice_vsi *ctrl_vsi = pf->eswitch.control_vsi;
-	int max_vsi_num = 0;
 	struct ice_vf *vf;
 	unsigned int bkt;
 
@@ -267,9 +266,6 @@ static int ice_eswitch_setup_reprs(struct ice_pf *pf)
 			goto err;
 		}
 
-		if (max_vsi_num < vsi->vsi_num)
-			max_vsi_num = vsi->vsi_num;
-
 		netif_napi_add(vf->repr->netdev, &vf->repr->q_vector->napi,
 			       ice_napi_poll);