bloat-o-meter: make it python3 compliant

Python 3 doesn't support the iterkeys() method anymore.  Use
iter(foo.keys()) instead of foo.iterkeys().

Signed-off-by: Marek Polacek <mmpolacek@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed