drm/i915: Fix multifunction SDVO detection

I can't think of any sensible reason to limit this to a mask of 0x0f,
ie, SDVO_OUTPUT_{TMDS,RGB,CVBS,SVID}0.
Signed-off-by: NAdam Jackson <ajax@redhat.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NKeith Packard <keithp@keithp.com>

drivers/gpu/drm/i915/intel_sdvo.c

@@ -1232,8 +1232,7 @@ static bool
 intel_sdvo_multifunc_encoder(struct intel_sdvo *intel_sdvo)
 {
 	/* Is there more than one type of output? */
-	int caps = intel_sdvo->caps.output_flags & 0xf;
-	return caps & -caps;
+	return hweight16(intel_sdvo->caps.output_flags) > 1;
 }
 
 static struct edid *