Get rid of getStride()

It was confusing and not properly used everywhere.
Callers should use the stride they get when they get
the buffer pointer.
diff --git a/unix/x0vncserver/XPixelBuffer.cxx b/unix/x0vncserver/XPixelBuffer.cxx
index f88eda4..f464182 100644
--- a/unix/x0vncserver/XPixelBuffer.cxx
+++ b/unix/x0vncserver/XPixelBuffer.cxx
@@ -35,8 +35,7 @@
     m_dpy(dpy),
     m_image(factory.newImage(dpy, rect.width(), rect.height())),
     m_offsetLeft(rect.tl.x),
-    m_offsetTop(rect.tl.y),
-    m_stride(0)
+    m_offsetTop(rect.tl.y)
 {
   // Fill in the PixelFormat structure of the parent class.
   format = PixelFormat(m_image->xim->bits_per_pixel,
@@ -57,7 +56,7 @@
 
   // Calculate the distance in pixels between two subsequent scan
   // lines of the framebuffer. This may differ from image width.
-  m_stride = m_image->xim->bytes_per_line * 8 / m_image->xim->bits_per_pixel;
+  stride = m_image->xim->bytes_per_line * 8 / m_image->xim->bits_per_pixel;
 
   // Get initial screen image from the X display.
   m_image->get(DefaultRootWindow(m_dpy), m_offsetLeft, m_offsetTop);
diff --git a/unix/x0vncserver/XPixelBuffer.h b/unix/x0vncserver/XPixelBuffer.h
index ab4f88e..da03161 100644
--- a/unix/x0vncserver/XPixelBuffer.h
+++ b/unix/x0vncserver/XPixelBuffer.h
@@ -46,9 +46,6 @@
   // Detect changed pixels, notify the server.
   inline void poll(VNCServer *server) { m_poller->poll(server); }
 
-  // Override PixelBuffer::getStride().
-  virtual int getStride() const { return m_stride; }
-
   // Override PixelBuffer::grabRegion().
   virtual void grabRegion(const rfb::Region& region);
 
@@ -60,9 +57,6 @@
   int m_offsetLeft;
   int m_offsetTop;
 
-  // The number of pixels in a row, with padding included.
-  int m_stride;
-
   // Copy pixels from the screen to the pixel buffer,
   // for the specified rectangular area of the buffer.
   inline void grabRect(const Rect &r) {