drm/i915: Don't offset the pin used for crt_ddc

Previously when converting the GMBUS pin to the GPIO reg, we would
offset the pin by one and then use the look-up table. Now that we first
try to use the GMBUS pin, we no longer need the offset and can use the
value from the VBIOS directly.
Reported-by: NCarlos R. Mafra <crmafra2@gmail.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_bios.c

@@ -299,7 +299,7 @@ parse_general_definitions(struct drm_i915_private *dev_priv,
 			int bus_pin = general->crt_ddc_gmbus_pin;
 			DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 			if (bus_pin >= 1 && bus_pin <= 6)
-				dev_priv->crt_ddc_pin = bus_pin - 1;
+				dev_priv->crt_ddc_pin = bus_pin;
 		} else {
 			DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 				  block_size);