oss-fuzz: exit dav1d_fuzzer after ~22 seconds

oss-fuzz uses a timeout of 25 seconds during fuzzing. It sometimes hits
this timeout with memory sanitizer. Instead of modifying the resolution
limit stop processing a sample ~22 seconds. The decoder should have
processed enough data in that time.
26 jobs for oss-fuzz_timeout in 6 minutes and 6 seconds (queued for 1 second)
Status Job ID Name Coverage
  Style
passed #301323
amd64 debian
style-check

00:00:24

 
  Build
passed #301324
amd64 debian
build-debian

00:00:44

passed #301332
debian aarch64
build-debian-aarch64

00:01:29

passed #301333
debian aarch64
build-debian-aarch64-clang-5

00:00:54

passed #301336
debian armv7
build-debian-armv7

00:01:34

passed #301337
debian armv7
build-debian-armv7-clang-5

00:01:22

passed #301339
docker ppc64le
build-debian-ppc64le

00:00:37

passed #301325
amd64 debian
build-debian-static

00:00:45

passed #301335
debian aarch64
build-debian-werror

00:00:32

passed #301326
amd64 debian
build-debian32

00:00:42

passed #301334
macos
build-macos

00:00:50

passed #301338
amd64 debian allowed to fail
build-ubuntu-snap

00:00:52

passed #301330
amd64 debian
build-win-arm32

00:00:28

passed #301331
amd64 debian
build-win-arm64

00:00:34

passed #301327
amd64 debian
build-win32

00:00:46

passed #301328
amd64 debian
build-win32-unaligned-stack

00:00:45

passed #301329
amd64 debian
build-win64

00:00:50

 
  Test
passed #301340
amd64 debian
test-debian

00:00:51

passed #301346
debian aarch64
test-debian-aarch64

00:02:23

passed #301348
debian armv7
test-debian-armv7-clang-5

00:02:42

passed #301342
amd64 debian
test-debian-asan

00:02:24

passed #301343
amd64 debian
test-debian-msan

00:01:04

passed #301347
docker ppc64le
test-debian-ppc64le

00:01:06

passed #301344
amd64 debian
test-debian-ubsan

00:01:28

passed #301341
amd64 debian
test-debian-unaligned-stack

00:00:50

passed #301345
amd64 debian
test-win64

00:00:58