Fix dump_my_stack to handle cleanly end of unwind

test/dump_my_stack.cpp

@@ -28,7 +28,11 @@ void dump_my_stack() {
                 (dl_rc && dl_inf.dli_sname) ? dl_inf.dli_sname : "(no symbol)",
                 cur_map_entry.pathname.c_str());
         fflush(stdout);
+        try {
             unw_context = dw.unwind_context(unw_context);
+        } catch(const DwarfInterpret::FirstUnwindFrame& exn) {
+            return;
+        }
     }
 }
 
@@ -36,6 +40,7 @@ void fill_my_stack(int stack_depth) {
     if(stack_depth == 0)
         dump_my_stack();
 
+    else
         fill_my_stack(stack_depth - 1);
 }