i915/HuC: Add an extra check for platforms that do not have HUC

Return silently without producing much noise on platforms
that have a HuC but the firmware is absent.

Cc: Ander Conselvan De Oliveira <ander.conselvan.de.oliveira@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@itel.com>
Signed-off-by: NAnusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: NAnder Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: NAnder Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1488398335-13121-1-git-send-email-anusha.srivatsa@intel.com

drivers/gpu/drm/i915/intel_huc.c

@@ -181,12 +181,14 @@ void intel_huc_init(struct drm_i915_private *dev_priv)
 	}
 
 	huc_fw->path = fw_path;
+
+	if (huc_fw->path == NULL)
+		return;
+
 	huc_fw->fetch_status = INTEL_UC_FIRMWARE_PENDING;
 
 	DRM_DEBUG_DRIVER("HuC firmware pending, path %s\n", fw_path);
 
-	WARN(huc_fw->path == NULL, "HuC present but no fw path\n");
-
 	intel_uc_fw_fetch(dev_priv, huc_fw);
 }