WaitSynchronizationN: Handle case where handle_count=0.

src/core/hle/svc.cpp

@@ -148,6 +148,8 @@ static Result WaitSynchronizationN(s32* out, Handle* handles, s32 handle_count,
     bool wait_all_succeeded = false;
     int handle_index = 0;
 
+    // If handles were passed in, iterate through them and wait/acquire the objects as needed
+    if (handle_count > 0) {
         while (handle_index < handle_count) {
             SharedPtr<Kernel::Object> object = Kernel::g_handle_table.GetGeneric(handles[handle_index]);
             if (object == nullptr)
@@ -170,6 +172,14 @@ static Result WaitSynchronizationN(s32* out, Handle* handles, s32 handle_count,
 
             handle_index++;
         }
+    }else {
+        // If no handles were passed in, put the thread to sleep only when wait_all=false
+        // NOTE: This is supposed to deadlock if no timeout was specified
+        if (!wait_all) {
+            wait_thread = true;
+            Kernel::WaitCurrentThread(WAITTYPE_SLEEP);
+        }
+    }
 
     // Change the thread state to waiting if blocking on all handles...
     if (wait_thread || wait_all_succeeded) {