detect frozen drives and show that the user

src/shred/shred.cpp

@@ -21,6 +21,7 @@ struct tfnge_stream
 };
 
 static struct tfnge_stream tfnge;
+#endif
 
 Shred::Shred()
 {
@@ -34,7 +35,7 @@ Shred::~Shred()
 }
 
 
-#endif
+
 /**
  * \brief   shred drive with shred
  * \param	pointer of Drive instance
@@ -51,7 +52,6 @@ void Shred::shredDrive(Drive* drive, int* ipSignalFd)
                 }
             drive->setTaskPercentage(i+0.05);
             write(*ipSignalFd, "A",1);
-
             usleep(20000);
         }
 #endif