drm/i915/dvo/sil164: Nuke pointless return statements

Drop the pointless return statements at the end of void
functions.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221122120825.26338-3-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/dvo_sil164.c

@@ -205,7 +205,6 @@ static void sil164_mode_set(struct intel_dvo_device *dvo,
 	  sil164_writeb(sil, 0x0c, 0x89);
 	  sil164_writeb(sil, 0x08, 0x31);*/
 	/* don't do much */
-	return;
 }
 
 /* set the SIL164 power state */
@@ -224,7 +223,6 @@ static void sil164_dpms(struct intel_dvo_device *dvo, bool enable)
 		ch &= ~SIL164_8_PD;
 
 	sil164_writeb(dvo, SIL164_REG8, ch);
-	return;
 }
 
 static bool sil164_get_hw_state(struct intel_dvo_device *dvo)