InputMethodService: Fix ignore case in showInputMethodPickerFromClient

Fix to avoid posting MSG_SHOW_IM_PICKER in
showInputMethodPickerFromClient when ignoring the request from the
client.

Change-Id: Iff8a0809aea892b4493d5cffbb91adba2d74414e

Author: Ethan1983

services/java/com/android/server/InputMethodManagerService.java

@@ -1225,6 +1225,7 @@ public void showInputMethodPickerFromClient(IInputMethodClient client) {
             if (mCurClient == null || client == null
                     || mCurClient.client.asBinder() != client.asBinder()) {
                 Slog.w(TAG, "Ignoring showInputMethodDialogFromClient of: " + client);
+                return;
             }
 
             mHandler.sendEmptyMessage(MSG_SHOW_IM_PICKER);