netinet/sctp_usrreq.c: fix gcc-16 build error
#729
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Upcoming `gcc-16` improved unused variable use detection and now
reports unused` cnt` as:
usrsctplib/netinet/sctp_usrreq.c: In function 'sctp_setopt':
usrsctplib/netinet/sctp_usrreq.c:5571:29: error: variable 'cnt' set but not used [-Werror=unused-but-set-variable=]
5571 | int cnt;
| ^~~
The change drops unused `cnt` variable.
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Upcoming
gcc-16improved unused variable use detection and now reports unusedcntas:The change drops unused
cntvariable.