-Wtautological-undefined-compare warning in split.cpp

[rmtheis]

I get a -Wtautological-undefined-compare warning when building for Android using clang and tess-two:

jni/com_googlecode_tesseract_android/src/ccstruct/split.cpp:223:7: warning: 'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to true [-Wtautological-undefined-compare]
  if (this != NULL) {
      ^~~~    ~~~~

[tfmorris]

Both #21 and #22 are caused by something buried inside the tprintf() macro expansion.

[rmtheis]

This was fixed in 4fdf272.