SoC Common: mailbox: optimize driver code size [1/3]

PD#SWPL-195147

Problem:
Need to optimize driver code size to avoid
size overflow

Solution:
Optimize mailbox driver code size

Verify:
Build Pass

Change-Id: Ifcb76d3bbbe350a8efc1d92fde6e5e053611064f
Signed-off-by: Yao Jie <jie.yao@amlogic.com>
diff --git a/s6/dsp.c b/s6/dsp.c
index efdfd77..b7bdd4b 100644
--- a/s6/dsp.c
+++ b/s6/dsp.c
@@ -23,14 +23,10 @@
 
 void vDSPVadWakeupInit(void)
 {
-	int ret;
-
-	ret = xInstallRemoteMessageCallbackFeedBack(AODSPA_CHANNEL,
-						    MBX_CMD_VAD_AWE_WAKEUP,
-						    xMboxVadWakeup,
-						    1);
-	if (ret == MBOX_CALL_MAX)
-		printf("mbox cmd 0x%x register fail\n", MBX_CMD_VAD_AWE_WAKEUP);
+	xInstallRemoteMessageCallbackFeedBack(AODSPA_CHANNEL,
+					      MBX_CMD_VAD_AWE_WAKEUP,
+					      xMboxVadWakeup,
+					      1);
 }
 
 void vDSPVadWakeupDeinit(void)