Removed unused variables

.gitignore

@@ -47,3 +47,4 @@
 /src/Release_DLL
 /app/Tester/Debug
 /Debug
+/app/Tester/x64/Debug

src/NotificationRequestPool.cpp

@@ -37,7 +37,6 @@ NotificationRequestPool::NotificationRequestPool(
 ) :
     client_(client),
     target_(target),
-    callback_(callback),
     stop_(false)
 {
     // prepare array of handles and request wrappers

src/NotificationRequestPool.h

@@ -41,7 +41,6 @@ class NotificationRequestPool
 
     PVIGEM_CLIENT client_;
     PVIGEM_TARGET target_;
-    FARPROC callback_;
 
     std::vector<std::unique_ptr<XusbNotificationRequest>> requests_;
     std::shared_ptr<boost::thread> thread_;