sqlops: use row index for storing result of sql_pvquery()

- reported by Savolainen Dmitri, FS#487

modules/sqlops/sql_api.c

@@ -600,9 +600,9 @@ int sql_do_pvquery(struct sip_msg *msg, sql_con_t *con, pv_elem_t *query,
 				LM_ERR("Missing pv spec for column %d\n", j+1);
 				goto error;
 			}
-			if (db_val2pv_spec(msg, &RES_ROWS(db_res)[0].values[j], &pv->sname) != 0) {
-				LM_ERR("Failed to convert value for column %.*s\n",
-				       RES_NAMES(db_res)[j]->len, RES_NAMES(db_res)[j]->s);
+			if (db_val2pv_spec(msg, &RES_ROWS(db_res)[i].values[j], &pv->sname) != 0) {
+				LM_ERR("Failed to convert value for column %.*s (row %d)\n",
+				       RES_NAMES(db_res)[j]->len, RES_NAMES(db_res)[j]->s, i);
 				goto error;
 			}
 			pv = pv->next;