ctest_memcheck: Change failure to find log file from error to warning
Sanitizers do not create a log file when no defects are found. Therefore,
it is currently impossible for ctest_memcheck to set both
CAPTURE_CMAKE_ERROR
and RETURN_VALUE
to zero.
With defects, CAPTURE_CMAKE_ERROR
=0 and RETURN_VALUE
=-1, as expected.
With no defects, CAPTURE_CMAKE_ERROR
=-1 and RETURN_VALUE
=0.