fix static checking warnings

mindspore/ccsrc/frontend/optimizer/pattern.h

@@ -259,7 +259,7 @@ class MatchResult {
   MatchResult() {}
   ~MatchResult() = default;
   void add_entry(PatternPtr pattern, AnfNodePtr node) { match_result_[pattern] = node; }
-  PatternNodeMap &result() { return match_result_; }
+  const PatternNodeMap &result() { return match_result_; }
   AnfNodePtr get_node(const PatternPtr &pattern);
   void merge(const MatchResultPtr &other_result);
   void clear() { match_result_.clear(); }

mindspore/ccsrc/utils/scoped_long_running.h

@@ -21,7 +21,6 @@
 #include <utility>
 
 namespace mindspore {
-
 // Base Class for scoped long running code.
 // Enter() should release some global resoure, like Python GIL;
 // Leave() should acquire the same global resource released.