Bugfix for #3012 @ http://bugme.osdl.org/show_bug.cgi?id=3012

The speedstep-ich driver only registers for CPU0 (which is a sane thing to
do). However, cpufreq_notify_transition() currently assumes the CPU
specified in the freqs.cpu parameter has actually been registered with the
CPUfreq core. This is obviously not the case for HT speedstep-ich CPUs,
causing an OOPS. The long-term solution will be to merge the "cpufreq
CPU group awareness patches" already RFC'ed to this list; but they still
need a bit of polishing and testing.

Thanks to Boris Fersing for reporting the bug and testing this fix.
Signed-off-by: Dominik Brodowski <linux@brodo.de>
Signed-off-by: Dave Jones <davej@redhat.com>