intel_extreme: Add missing DisplayPipe destructor

src/add-ons/accelerants/intel_extreme/DisplayPipe.cpp

@@ -53,6 +53,11 @@ DisplayPipe::DisplayPipe(pipe_index pipeIndex)
 }
 
 
+DisplayPipe::~DisplayPipe()
+{
+}
+
+
 bool
 DisplayPipe::IsEnabled()
 {

src/add-ons/accelerants/intel_extreme/DisplayPipe.h

@@ -30,7 +30,7 @@ void program_pipe_color_modes(uint32 colorMode);
 class DisplayPipe {
 public:
 									DisplayPipe(pipe_index pipeIndex);
-virtual								~DisplayPipe();
+									~DisplayPipe();
 
 		pipe_index					Index()
 										{ return fPipeIndex; }