[analyzer] Fix unknown block calls to have zero parameters.

Right now they report to have one parameter with null decl,
because initializing an ArrayRef of pointers with a nullptr
yields an ArrayRef to an array of one null pointer.

Fixes a crash in the OSObject section of RetainCountChecker.

Differential Revision: https://reviews.llvm.org/D55671

llvm-svn: 349229

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/StaticAnalyzer/Core/CallEvent.cpp b/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
index 767116630f4..8d9338b21c1 100644
--- a/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
+++ b/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
@@ -837,7 +837,7 @@ const BlockDataRegion *BlockCall::getBlockRegion() const {
 ArrayRef<ParmVarDecl*> BlockCall::parameters() const {
   const BlockDecl *D = getDecl();
   if (!D)
-    return nullptr;
+    return None;
   return D->parameters();
 }