Consistent use of stride vs pitch

Consistently use the term stride rather than pitch. Also
consistently represent the stride in number of pixels rather
than number of bytes. There is so much code that assumes
proper alignment already that we do not need the extra resolution.
diff --git a/common/rfb/tightDecode.h b/common/rfb/tightDecode.h
index fb39d99..06c8477 100644
--- a/common/rfb/tightDecode.h
+++ b/common/rfb/tightDecode.h
@@ -257,8 +257,7 @@
   // We always use direct decoding with JPEG images
   int stride;
   rdr::U8 *buf = handler->getRawBufferRW(r, &stride);
-  jd.decompress(netbuf, compressedLen, buf, stride * clientpf.bpp / 8, r,
-                clientpf);
+  jd.decompress(netbuf, compressedLen, buf, stride, r, clientpf);
   handler->releaseRawBuffer(r);
 
   delete [] netbuf;