gc: reformat source code to conform to Linux codestyle

Main motivation is getting rid of tab-space mix.
27 jobs for kr_cache_gc in 13 minutes and 27 seconds (queued for 10 seconds)
Status Job ID Name Coverage
  Build
passed #279329
amd64 linux docker
archive

00:00:54

passed #279330
amd64 linux docker
build

00:01:02

passed #279331
amd64 linux docker
build-asan

00:01:02

passed #279332
docker
kres-gen

00:00:59

 
  Test
passed #279333
docker delayed
build:darwin

00:00:54

passed #279334
amd64 linux docker
deckard

00:02:43

passed #279335
docker delayed
doc

00:01:13

passed #279336
dind
docker

00:01:56

passed #279337
docker delayed
lint:other

00:00:54

passed #279338
amd64 linux docker delayed
lint:pedantic

00:01:14

passed #279339
amd64 linux docker
lint:scan-build

00:02:29

passed #279340
amd64 linux docker
lint:tidy

00:03:12

passed #279341
privileged
pkg:epel-7

00:01:52

passed #279342
privileged
pkg:fedora-29

00:02:30

passed #279343
amd64 linux docker
respdiff:basic

00:05:09

passed #279344
amd64 linux docker delayed
test:valgrind

00:02:17

 
  Extended
canceled #279346
respdiff
fwd-tls6-kresd.udp6

00:07:09

canceled #279347
respdiff
fwd-udp6-kresd.udp6

00:07:09

canceled #279351
respdiff
fwd-udp6-unbound.tcp6

00:07:09

canceled #279352
respdiff
fwd-udp6-unbound.tls6

00:07:09

canceled #279350
respdiff
fwd-udp6-unbound.udp6

00:07:09

canceled #279349
respdiff
iter.tls6

00:07:09

canceled #279348
respdiff
iter.udp6

00:07:09

passed #279345
amd64 linux docker
pytests

00:04:35

canceled #279353
respdiff
resperf:fwd-tls6.udp-asan

00:07:09

canceled #279354
respdiff
resperf:fwd-udp6.udp-asan

00:07:08

canceled #279355
respdiff
resperf:iter.udp-asan

00:07:08