drm/amd/powerplay/cz: print message if smc message fails

Helpful in debugging.

Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/powerplay/smumgr/cz_smumgr.c

···
 	result = SMUM_WAIT_FIELD_UNEQUAL(smumgr,
 					SMU_MP1_SRBM2P_RESP_0, CONTENT, 0);
 	if (result != 0) {
-		pr_err("cz_send_msg_to_smc_async failed\n");
+		pr_err("cz_send_msg_to_smc_async (0x%04x) failed\n", msg);
 		return result;
 	}