ice: don't ignore return codes in VSI related code

There were few smatch warnings reported by Dan:
- ice_vsi_cfg_xdp_txqs can return 0 instead of ret, which is cleaner
- return values in ice_vsi_cfg_def were ignored
- in ice_vsi_rebuild return value was ignored in case rebuild failed,
  it was a never reached code, however, rewrite it for clarity.
- ice_vsi_cfg_tc can return 0 instead of ret

Fixes: 6624e780 ("ice: split ice_vsi_setup into smaller functions")
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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

@@ -2126,7 +2126,7 @@ int ice_vsi_cfg_xdp_txqs(struct ice_vsi *vsi)
 	ice_for_each_rxq(vsi, i)
 		ice_tx_xsk_pool(vsi, i);
 
-	return ret;
+	return 0;
 }
 
 /**
@@ -2693,12 +2693,14 @@ ice_vsi_cfg_def(struct ice_vsi *vsi, struct ice_vsi_cfg_params *params)
 		return ret;
 
 	/* allocate memory for Tx/Rx ring stat pointers */
-	if (ice_vsi_alloc_stat_arrays(vsi))
+	ret = ice_vsi_alloc_stat_arrays(vsi);
+	if (ret)
 		goto unroll_vsi_alloc;
 
 	ice_alloc_fd_res(vsi);
 
-	if (ice_vsi_get_qs(vsi)) {
+	ret = ice_vsi_get_qs(vsi);
+	if (ret) {
 		dev_err(dev, "Failed to allocate queues. vsi->idx = %d\n",
 			vsi->idx);
 		goto unroll_vsi_alloc_stat;
@@ -2811,6 +2813,7 @@ ice_vsi_cfg_def(struct ice_vsi *vsi, struct ice_vsi_cfg_params *params)
 		break;
 	default:
 		/* clean up the resources and exit */
+		ret = -EINVAL;
 		goto unroll_vsi_init;
 	}
 
@@ -3508,11 +3511,11 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, u32 vsi_flags)
 		if (vsi_flags & ICE_VSI_FLAG_INIT) {
 			ret = -EIO;
 			goto err_vsi_cfg_tc_lan;
-		} else {
+		}
+
 		kfree(coalesce);
 		return ice_schedule_reset(pf, ICE_RESET_PFR);
 	}
-	}
 
 	ice_vsi_realloc_stat_arrays(vsi, prev_txq, prev_rxq);
 
@@ -3759,7 +3762,7 @@ int ice_vsi_cfg_tc(struct ice_vsi *vsi, u8 ena_tc)
 	dev = ice_pf_to_dev(pf);
 	if (vsi->tc_cfg.ena_tc == ena_tc &&
 	    vsi->mqprio_qopt.mode != TC_MQPRIO_MODE_CHANNEL)
-		return ret;
+		return 0;
 
 	ice_for_each_traffic_class(i) {
 		/* build bitmap of enabled TCs */