ice: Fix VSI rebuild WARN_ON check for VF

In commit b03d519 ("ice: store VF pointer instead of VF ID")
WARN_ON checks were added to validate the vsi->vf pointer and
catch programming errors. However, one check to vsi->vf was missed.
This caused a call trace when resetting VFs.

Fix ice_vsi_rebuild by encompassing VF pointer in WARN_ON check.

Fixes: b03d519 ("ice: store VF pointer instead of VF ID")
Signed-off-by: Benjamin Mikailenko <benjamin.mikailenko@intel.com>
Tested-by: Marek Szlosek <marek.szlosek@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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

@@ -3181,7 +3181,7 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi)
 
 	pf = vsi->back;
 	vtype = vsi->type;
-	if (WARN_ON(vtype == ICE_VSI_VF) && !vsi->vf)
+	if (WARN_ON(vtype == ICE_VSI_VF && !vsi->vf))
 		return -EINVAL;
 
 	ice_vsi_init_vlan_ops(vsi);