Dear Maintainer,

I'd like to submit a patch to fix the Debci failures reported as below.
https://ci.debian.net/packages/f/fldiff/unstable/amd64/

The failure is caused by the lack of runtime dependency psmisc in debian/tests/control

With the patch attached, the autopkgtest tests are successfully:
autopkgtest [06:06:11]: test test-xvfb: [-----------------------
fldiff: no process found
info: fldiff started ok.
Terminated
autopkgtest [06:06:13]: test test-xvfb: -----------------------]
autopkgtest [06:06:13]: test test-xvfb:  - - - - - - - - - - results - - - - - - - - - -
test-xvfb            PASS
autopkgtest [06:06:13]: @@@@@@@@@@@@@@@@@@@@ summary
test-xvfb            PASS

Would you please accept this patch?

Best Regards,
Peng