opencl: Fix wrong implementation of function getNumDeviceWithEmptyScore
opencl: Fix wrong implementation of function getNumDeviceWithEmptyScore

gcc report:

opencl_device_selection.h: In function 'ds_status getNumDeviceWithEmptyScore(ds_profile*, unsigned int*)':
opencl_device_selection.h:589:13: warning: value computed is not used [-Wunused-value]
       *num++;
             ^

This is caused by a buggy implementation which increases the value of num
instead of *num.

Signed-off-by: Stefan Weil <8d4c780fcfdc41841e5070f4c43da8958ba6aec0@weilnetz.de>

jbarlow83/tesseract,jbarlow83/tesseract,tesseract-ocr/tesseract,stweil/tesseract,tesseract-ocr/tesseract,stweil/tesseract,jbarlow83/tesseract,amitdo/tesseract,stweil/tesseract,UB-Mannheim/tesseract,jbarlow83/tesseract,tesseract-ocr/tesseract,amitdo/tesseract,jbarlow83/tesseract,tesseract-ocr/tesseract,amitdo/tesseract,stweil/tesseract,tesseract-ocr/tesseract,UB-Mannheim/tesseract,UB-Mannheim/tesseract,amitdo/tesseract,UB-Mannheim/tesseract,UB-Mannheim/tesseract,amitdo/tesseract,stweil/tesseract