src: remove trailing whitespaces

src/dnssec/lib/kasp/dir/json.h

src/dnssec/shared/pem.c

src/dnssec/shared/pem.h

src/dnssec/tests/random.c

src/dnssec/utils/cmdparse/value.c

src/dnssec/utils/keymgr.c

src/dnssec/utils/legacy/key.c

src/dnstap/dnstap.h

src/dnstap/reader.c

src/dnstap/writer.c

src/knot/common/evsched.c

src/knot/conf/conf.c

src/knot/conf/extra.c

src/knot/ctl/estimator.c

src/knot/ctl/process.h

src/knot/dnssec/zone-keys.c

src/knot/dnssec/zone-nsec.c

src/knot/main.c

src/knot/modules/dnsproxy.c

src/knot/modules/dnstap.c