sdm: Fix Wconversion errors

Change-Id: Ica8ecd83e44126d7ef5d8595dcaf52f88aea6e70
CRs-fixed: 974030
diff --git a/sdm/libs/utils/debug.cpp b/sdm/libs/utils/debug.cpp
index d0d21ee..7082421 100644
--- a/sdm/libs/utils/debug.cpp
+++ b/sdm/libs/utils/debug.cpp
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2014 - 2015, The Linux Foundation. All rights reserved.
+* Copyright (c) 2014 - 2016, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -52,11 +52,11 @@
   return value;
 }
 
-int Debug::GetIdleTimeoutMs() {
+uint32_t Debug::GetIdleTimeoutMs() {
   int value = IDLE_TIMEOUT_DEFAULT_MS;
   debug_.debug_handler_->GetProperty("sdm.idle_time", &value);
 
-  return value;
+  return UINT32(value);
 }
 
 int Debug::GetBootAnimLayerCount() {