Fix ugly shell bug that had no effect

2 jobs for opkg-content-fix in 8 minutes and 46 seconds
Name Stage Failure
test_busybox Test There is an unknown failure, please try again
/builds/turris/updater/tests/check/src/check_msg.c:247: warning: the use of `tempnam' is dangerous, better use `mkstemp'
mkdir -p ./testdir
SUPPRESS_LOG=1 S=. TMPDIR=/builds/turris/updater/testdir COVERAGEDIR=/builds/turris/updater/.lua_coverage bin/ctest-events
Running suite(s): Event loop
99%: Checks: 1057, Failures: 1, Errors: 0
tests/events.c:161:F:commands:command_start_noio:0: Assertion 'CK_TERMINATED == infos[i].killed' failed: CK_TERMINATED == 0, infos[i].killed == 1
tests/Makefile.dir:125: recipe for target 'test-c-events' failed
make: *** [test-c-events] Error 1
ERROR: Job failed: exit code 1