drm/i915: Use standard form terminating condition for lane for loops

Use <4 instead of <=3 as the terminating condition for the
loops over the 4 lanes.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211006204937.30774-4-ville.syrjala@linux.intel.comReviewed-by: NJani Nikula <jani.nikula@intel.com>

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

@@ -1067,7 +1067,7 @@ static void icl_ddi_combo_vswing_program(struct intel_encoder *encoder,
 
 	/* Program PORT_TX_DW4 */
 	/* We cannot write to GRP. It would overwrite individual loadgen. */
-	for (ln = 0; ln <= 3; ln++) {
+	for (ln = 0; ln < 4; ln++) {
 		val = intel_de_read(dev_priv, ICL_PORT_TX_DW4_LN(ln, phy));
 		val &= ~(POST_CURSOR_1_MASK | POST_CURSOR_2_MASK |
 			 CURSOR_COEFF_MASK);
@@ -1114,7 +1114,7 @@ static void icl_combo_phy_set_signal_levels(struct intel_encoder *encoder,
 	 * <= 6 GHz and 1,2 lanes (LN0=0, LN1=1, LN2=1, LN3=0)
 	 * > 6 GHz (LN0=0, LN1=0, LN2=0, LN3=0)
 	 */
-	for (ln = 0; ln <= 3; ln++) {
+	for (ln = 0; ln < 4; ln++) {
 		val = intel_de_read(dev_priv, ICL_PORT_TX_DW4_LN(ln, phy));
 		val &= ~LOADGEN_SELECT;