registrar: Fix incomplete commit d2a958d

Many thanks to @fedorna for catching this one!

Fixes #1588

modules/registrar/reg_mod.c

@@ -457,7 +457,7 @@ static int registrar_fixup(void** param, int param_no)
 		return fixup_spve(param);
 	} else if (param_no == 3) {
 		/* AOR - from PVAR */
-		return fixup_pvar(param);
+		return fixup_sgp(param);
 	} else {
 		/* ownership tag */
 		return fixup_sgp(param);

modules/registrar/save.c

@@ -578,7 +578,6 @@ int save_aux(struct sip_msg* _m, str* forced_binding, char* _d, char* _f,
 	int st;
 	str uri;
 	str flags_s;
-	pv_value_t val;
 
 	rerrno = R_FINE;
 	memset( &sctx, 0 , sizeof(sctx));
@@ -668,15 +667,10 @@ int save_aux(struct sip_msg* _m, str* forced_binding, char* _d, char* _f,
 	update_act_time();
 
 	if (_s) {
-		if (pv_get_spec_value( _m, (pv_spec_p)_s, &val)!=0) {
+		if (fixup_get_svalue( _m, (gparam_p)_s, &uri)!=0) {
 			LM_ERR("failed to get PV value\n");
 			goto return_minus_one;
 		}
-		if ( (val.flags&PV_VAL_STR)==0 ) {
-			LM_ERR("PV vals is not string\n");
-			goto return_minus_one;
-		}
-		uri = val.rs;
 	} else {
 		uri = get_to(_m)->uri;
 	}