svc: Return success from SleepThread

src/core/hle/kernel/svc.cpp

@@ -1171,13 +1171,13 @@ static void ExitThread() {
 }
 
 /// Sleep the current thread
-static void SleepThread(s64 nanoseconds) {
+static ResultCode SleepThread(s64 nanoseconds) {
     LOG_TRACE(Kernel_SVC, "called nanoseconds={}", nanoseconds);
 
     // Don't attempt to yield execution if there are no available threads to run,
     // this way we avoid a useless reschedule to the idle thread.
     if (nanoseconds == 0 && !Core::System::GetInstance().CurrentScheduler().HaveReadyThreads())
-        return;
+        return RESULT_SUCCESS;
 
     // Sleep current thread and check for next thread to schedule
     WaitCurrentThread_Sleep();
@@ -1186,6 +1186,7 @@ static void SleepThread(s64 nanoseconds) {
     GetCurrentThread()->WakeAfterDelay(nanoseconds);
 
     Core::System::GetInstance().PrepareReschedule();
+    return RESULT_SUCCESS;
 }
 
 /// Wait process wide key atomic

src/core/hle/kernel/svc_wrap.h

@@ -33,6 +33,11 @@ void SvcWrap() {
     FuncReturn(func(Param(0)).raw);
 }
 
+template <ResultCode func(s64)>
+void SvcWrap() {
+    FuncReturn(func(static_cast<s64>(Param(0))).raw);
+}
+
 template <ResultCode func(u32)>
 void SvcWrap() {
     FuncReturn(func(static_cast<u32>(Param(0))).raw);
@@ -248,11 +253,6 @@ void SvcWrap() {
     func();
 }
 
-template <void func(s64)>
-void SvcWrap() {
-    func(static_cast<s64>(Param(0)));
-}
-
 template <void func(u64, u64 len)>
 void SvcWrap() {
     func(Param(0), Param(1));