ci : fix -Werror=return-type in clip.cpp so ci/run.sh can run without issue (#15221)
* Fix -Werror=return-type so ci/run.sh can run
* Update tools/mtmd/clip.cpp
Co-authored-by: Diego Devesa <slarengh@gmail.com>
* Remove false now that we have abort
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Co-authored-by: Diego Devesa <slarengh@gmail.com>