Avoid assertion error for no matched function in statement probe

* dwflpp.cxx (iterate_over_functions): Return for NULL pointer.
* testsuite/systemtap.base/statement.exp: Add test case.

1 files changed, 2 insertions, 0 deletions

diff --git a/dwflpp.cxx b/dwflpp.cxx
index c31fbe4e..d02698b2 100644
--- a/dwflpp.cxx
+++ b/dwflpp.cxx
@@ -791,6 +791,8 @@ dwflpp::iterate_over_srcfile_lines (char const * srcfile,
   auto_free_ref<Dwarf_Line**> free_srcsp(srcsp);
 
   get_module_dwarf();
+  if (!this->function)
+    return;
 
   if (line_type == RELATIVE)
     {