Whitespace-only in common-opencl.c
Allow calling opencl_get_user_preferences() with NULL argument.
OpenCL formats: Use more shared code from common-opencl.c
Merge branch 'bleeding-jumbo' into memdbg

* bleeding-jumbo:
  OpenCL formats: Use more shared code from common-opencl.c
  Allow calling opencl_get_user_preferences() with NULL argument.
  Whitespace-only in common-opencl.c