[python] fixlet in new-backtrace

[Tom Tromey]

I found this while doing a merge to a private branch.
newest_thread is a method in the gdb module, not in InferiorThread.

Tom

diff --git a/gdb/python/lib/gdb/command/backtrace.py b/gdb/python/lib/gdb/command/backtrace.py
index 2aa5b90..eeea909 100644
--- a/gdb/python/lib/gdb/command/backtrace.py
+++ b/gdb/python/lib/gdb/command/backtrace.py
@@ -80,7 +80,7 @@ Use of the 'raw' qualifier avoids any filtering by loadable modules.

# FIXME: provide option to start at selected frame
# However, should still number as if starting from newest
- newest_frame = gdb.selected_thread ().newest_frame ()
+ newest_frame = gdb.newest_frame()
iter = itertools.imap (FrameWrapper,
FrameIterator (newest_frame))
if filter: