drm/i915/tv: Drop redundant null checks

Neither 'tv_mode' or 'color_conversion' can be NULL,
so drop the pointless checks.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231207193441.20206-9-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -1417,9 +1417,6 @@ set_tv_mode_timings(struct drm_i915_private *dev_priv,
 static void set_color_conversion(struct drm_i915_private *dev_priv,
 				 const struct color_conversion *color_conversion)
 {
-	if (!color_conversion)
-		return;
-
 	intel_de_write(dev_priv, TV_CSC_Y,
 		       (color_conversion->ry << 16) | color_conversion->gy);
 	intel_de_write(dev_priv, TV_CSC_Y2,
@@ -1454,9 +1451,6 @@ static void intel_tv_pre_enable(struct intel_atomic_state *state,
 	int xpos, ypos;
 	unsigned int xsize, ysize;
 
-	if (!tv_mode)
-		return;	/* can't happen (mode_prepare prevents this) */
-
 	tv_ctl = intel_de_read(dev_priv, TV_CTL);
 	tv_ctl &= TV_CTL_SAVE;