Update Tools/gdb/libpython.py

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: colesbury

Tools/gdb/libpython.py

@@ -1275,8 +1275,9 @@ def print_traceback_until_shim(self, frame_index = None):
             if not interp_frame:
                 sys.stdout.write('  (unable to read python frame information)\n')
                 return None
-            elif interp_frame.is_shim():
+            if interp_frame.is_shim():
                 return interp_frame.previous()
+
             if frame_index is not None:
                 line = interp_frame.get_truncated_repr(MAX_OUTPUT_LEN)
                 sys.stdout.write('#%i %s\n' % (frame_index, line))