drm/i915/guc: Switch to CT_ERROR in ct_read

As we now have "ct" available in ct_read function we can switch
from generic DRM_ERROR to our custom CT_ERROR.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200117082039.65644-5-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c

@@ -617,7 +617,7 @@ static int ct_read(struct intel_guc_ct *ct, u32 *data)
 	/* message len with header */
 	len = ct_header_get_len(data[0]) + 1;
 	if (unlikely(len > (u32)available)) {
-		DRM_ERROR("CT: incomplete message %*ph %*ph %*ph\n",
+		CT_ERROR(ct, "Incomplete message %*ph %*ph %*ph\n",
 			 4, data,
 			 4 * (head + available - 1 > size ?
 			      size - head : available - 1), &cmds[head],
@@ -636,7 +636,7 @@ static int ct_read(struct intel_guc_ct *ct, u32 *data)
 	return 0;
 
 corrupted:
-	DRM_ERROR("CT: Corrupted descriptor addr=%#x head=%u tail=%u size=%u\n",
+	CT_ERROR(ct, "Corrupted descriptor addr=%#x head=%u tail=%u size=%u\n",
 		 desc->addr, desc->head, desc->tail, desc->size);
 	desc->is_in_error = 1;
 	return -EPIPE;