port valgrind fix from Neil Wilson
@@ -321,7 +321,7 @@ bool MapVisitor::VisitCallExpr(CallExpr *Call) {
ProbeVisitor::ProbeVisitor(ASTContext &C, Rewriter &rewriter,
set<Decl *> &m, bool track_helpers) :
- C(C), rewriter_(rewriter), m_(m), track_helpers_(track_helpers),
+ C(C), rewriter_(rewriter), m_(m), ctx_(nullptr), track_helpers_(track_helpers),
addrof_stmt_(nullptr), is_addrof_(false) {
const char **calling_conv_regs = get_call_conv();
has_overlap_kuaddr_ = calling_conv_regs == calling_conv_regs_s390x;
