drm/i915: dvo_ch7xxx: fix vsync polarity setting

This fixes a typo which set the wrong vsync and possibly also hsync
polarity for any modes with positive vsync polarity.

Signed-off-by: Imre Deak <[e-mail]>
Cc: Jesse Barnes <[e-mail]>
Reviewed-by: Chris Wilson <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/i915/dvo_ch7xxx.c

···
 		idf |= CH7xxx_IDF_HSP;
 
 	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
-		idf |= CH7xxx_IDF_HSP;
+		idf |= CH7xxx_IDF_VSP;
 
 	ch7xxx_writeb(dvo, CH7xxx_IDF, idf);
 }