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netfilter: conntrack: use fallthrough to cleanup
These cases all use the same function. we can simplify the code through
fallthrough.
$ size net/netfilter/nf_conntrack_core.o
text data bss dec hex filename
before 81601 81430 768 163799 27fd7 net/netfilter/nf_conntrack_core.o
after 80361 81430 768 162559 27aff net/netfilter/nf_conntrack_core.o
Arch: aarch64
Gcc : gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
Reported-by: k2ci <kernel-bot@kylinos.cn>
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>