[OPENMP]Fix PR41617: crash on template instantiation.

Fixed the crash on the template instantiation when trying to check the
data locality in the current instantiation scope.

llvm-svn: 359459
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 2011c0b..0aebd8e 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -1145,7 +1145,7 @@
       return false;
     TopScope = I->CurScope ? I->CurScope->getParent() : nullptr;
     Scope *CurScope = getCurScope();
-    while (CurScope != TopScope && !CurScope->isDeclScope(D))
+    while (CurScope && CurScope != TopScope && !CurScope->isDeclScope(D))
       CurScope = CurScope->getParent();
     return CurScope != TopScope;
   }