revert snapshot.py change

Author: larkee

google/cloud/spanner_v1/snapshot.py

@@ -225,11 +225,12 @@ def execute_sql(
             retry=retry,
             timeout=timeout,
         )
-        self._read_request_count += 1
-        self._execute_sql_count += 1
 
         iterator = _restart_on_unavailable(restart)
 
+        self._read_request_count += 1
+        self._execute_sql_count += 1
+
         if self._multi_use:
             return StreamedResultSet(iterator, source=self)
         else: