GCAdapter: Exit early if the adapter fails to open on Android

This is only so that indentation is consistent with the non-android code.

Source/Core/InputCommon/GCAdapter.cpp

@@ -192,8 +192,15 @@ static void Read()
 
   bool connected = env->CallStaticBooleanMethod(s_adapter_class, openadapter_func);
 
-  if (connected)
+  if (!connected)
   {
+    s_fd = 0;
+    s_detected = false;
+
+    NOTICE_LOG_FMT(CONTROLLERINTERFACE, "GC Adapter failed to open!");
+    return;
+  }
+
   s_write_adapter_thread_running.Set(true);
   s_write_adapter_thread = std::thread(Write);
 
@@ -229,7 +236,6 @@ static void Read()
     s_write_happened.Set();  // Kick the waiting event
     write_adapter_thread.join();
   }
-  }
 
   s_fd = 0;
   s_detected = false;