[CPUFREQ] Remove extra arg from dprintk in cpufreq/speedstep-smi.c

Minor fallout from my upcoming __attribute__((format(printf,x,y)))
patches. The variable 'result' is untouched, so this patch just removes
it.

Signed-off-by: Mika Kukkonen <mikukkon@gmail.com>
Signed-off-by: Dave Jones <davej@redhat.com>