BUG: fix small syntax errors in the gperf script

[huajingyun01]

hi，when I compile libseccomp, the error is as follows:

  CC       libseccomp_la-syscalls.lo
  GEN      syscalls.perf
sed: can't find label for jump to 'r1}'
make[3]: *** [Makefile:1425: syscalls.perf] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [Makefile:935: all-recursive] Error 1

more detail：

~/test/libseccomp/src$ cat ./syscalls.csv | grep -v '^#'|nl -ba -s, -v0 | sed -e '{s|^[[:space:]]\+\([0-9]\+\),\([^,]\+\),\(.*\)|\2,\1,\3|;};' -e '{:r1; {s|\([^,]\+\)\(.*\)[^_]PNR|\1\2,__PNR_\1|g;}; t r1};' -e '{s|,KV_|,SCMP_KV_|g;};'
sed: can't find label for jump to 'r1}'
~/test/libseccomp/src$ 

[coveralls]

coverage: 89.474%. remained the same
when pulling 9452b9b on huajingyun01:main
into 47ca644 on seccomp:main.

[pcmoore]

I'm not sure why we've never seen this error before, but this patch looks good to me. As a note to @drakenclimber and myself, when merging please adjust the subject line to "gperf: fix sed syntax" or similar.

Acked-by: Paul Moore <paul@paul-moore.com>

[drakenclimber]

Pushed to main in commit 99bd9e5. Thanks, @huajingyun01