netfilter: nf_conntrack_sip: don't use simple_strtoul

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EUVD-2021-22577

Malware in sbrugna...

DEBIAN-CVE-2021-35942

The wordexp function in the GNU C Library aka glibc through 2.33 may crash or read arbitrary memory in parseparam in posix/wordexp.c when called with an untrusted, crafted pattern, potentially resulting in a denial of service or disclosure of information. This occurs because atoi was used but...