Try fixes a single puts cause two syscall.

5 jobs for core_io in 5 minutes and 48 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #30351
build:linux

00:02:11

passed #30352
build:redox

00:02:10

 
  Test
passed #30355
fmt

00:00:50

passed #30353
test:linux

00:02:29

failed #30354
allowed to fail
test:redox

00:03:37

 
Name Stage Failure
failed
test:redox Test
redoxer: copying 'libstdc++.so.6.0.25' to '/lib'
redoxer: copying '.' to '/root'
Could not allocate dynamic translator buffer

## redoxer (failure, qemu exit status ExitStatus(ExitStatus(256)) ##
make[1]: *** [Makefile:196: verify] Error 2
make[1]: Leaving directory '/builds/lygstate/relibc/tests'
make: *** [Makefile:111: test] Error 2
ERROR: Job failed: exit code 1