Fix up assertion a bit more

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140424 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReaderStmt.cpp b/lib/Serialization/ASTReaderStmt.cpp
index d025097..0571c10 100644
--- a/lib/Serialization/ASTReaderStmt.cpp
+++ b/lib/Serialization/ASTReaderStmt.cpp
@@ -1061,7 +1061,7 @@
 void ASTStmtReader::VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
   VisitExpr(E);
 
-  assert(Record[Idx] == (unsigned)E->Param.getInt() && "We messed up at creation ?");
+  assert((bool)Record[Idx] == E->Param.getInt() && "We messed up at creation ?");
   ++Idx; // HasOtherExprStored and SubExpr was handled during creation.
   E->Param.setPointer(ReadDeclAs<ParmVarDecl>(Record, Idx));
   E->Loc = ReadSourceLocation(Record, Idx);