ice: Fix a couple NULL vs IS_ERR() bugs

The ice_repr_create() function returns error pointers.  It never returns
NULL.  Fix the callers to check for IS_ERR().

Fixes: 977514fb ("ice: create port representor for SF")
Fixes: 415db839 ("ice: make representor code generic")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/7f7aeb91-8771-47b8-9275-9d9f64f947dd@stanley.mountainSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -452,8 +452,8 @@ struct ice_repr *ice_repr_create_vf(struct ice_vf *vf)
 		return ERR_PTR(-EINVAL);
 
 	repr = ice_repr_create(vsi);
-	if (!repr)
-		return ERR_PTR(-ENOMEM);
+	if (IS_ERR(repr))
+		return repr;
 
 	repr->type = ICE_REPR_TYPE_VF;
 	repr->vf = vf;
@@ -501,8 +501,8 @@ struct ice_repr *ice_repr_create_sf(struct ice_dynamic_port *sf)
 {
 	struct ice_repr *repr = ice_repr_create(sf->vsi);
 
-	if (!repr)
-		return ERR_PTR(-ENOMEM);
+	if (IS_ERR(repr))
+		return repr;
 
 	repr->type = ICE_REPR_TYPE_SF;
 	repr->sf = sf;