hal: Remove return values from void functions

Remove values returned from void functions to resolve CLANG
compilation issues.

CRs-Fixed: 963698
Change-Id: I75a960b116985bbf226e4984aec4db5676448824
diff --git a/hal/audio_extn/dolby.c b/hal/audio_extn/dolby.c
index 92ef4ac..c8bf543 100644
--- a/hal/audio_extn/dolby.c
+++ b/hal/audio_extn/dolby.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2011-2016, The Linux Foundation. All rights reserved.
  * Not a Contribution.
  *
  * Copyright (C) 2010 The Android Open Source Project
@@ -772,9 +772,7 @@
         ds2extnmod.dap_hal_set_hw_info(DMID, (void*)(&dolby_license.dmid));
     } else {
         ALOGV("%s: dap_hal_set_hw_info is NULL", __func__);
-        return ret;
     }
-    return 0;
 }