drm/i915/dvo: fix debug logging on unknown DID

Print DID not VID on the DID error path. Looks like a copy-paste error
from the VID error path. Clarify and clean up error logging, making them
distinguishable from each other, while at it.
Reported-by: Petru Mihancea <petrum@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101243Reviewed-by: Clinton Taylor <clinton.a.taylor@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170531101631.26953-1-jani.nikula@intel.com

drivers/gpu/drm/i915/dvo_ch7xxx.c

@@ -217,8 +217,7 @@ static bool ch7xxx_init(struct intel_dvo_device *dvo,
 
 	name = ch7xxx_get_id(vendor);
 	if (!name) {
-		DRM_DEBUG_KMS("ch7xxx not detected; got 0x%02x from %s "
-				"slave %d.\n",
+		DRM_DEBUG_KMS("ch7xxx not detected; got VID 0x%02x from %s slave %d.\n",
 			      vendor, adapter->name, dvo->slave_addr);
 		goto out;
 	}
@@ -229,9 +228,8 @@ static bool ch7xxx_init(struct intel_dvo_device *dvo,
 
 	devid = ch7xxx_get_did(device);
 	if (!devid) {
-		DRM_DEBUG_KMS("ch7xxx not detected; got 0x%02x from %s "
-				"slave %d.\n",
-			  vendor, adapter->name, dvo->slave_addr);
+		DRM_DEBUG_KMS("ch7xxx not detected; got DID 0x%02x from %s slave %d.\n",
+			      device, adapter->name, dvo->slave_addr);
 		goto out;
 	}