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commite7c42bf4d3upstream. This patch uses addition assignment operator (+=) to append strings instead of duplicating the variable name in mptcp_connect.sh and mptcp_join.sh. This can make the statements shorter. Note: in mptcp_connect.sh, add a local variable extra in do_transfer to save the various extra warning logs, using += to append it. And add a new variable tc_info to save various tc info, also using += to append it. This can make the code more readable and prepare for the next commit. Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://lore.kernel.org/r/20240308-upstream-net-next-20240308-selftests-mptcp-unification-v1-8-4f42c347b653@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> [ Conflicts in mptcp_connect.sh: this commit was supposed to be backported before commit7a1b3490f4("mptcp: don't account accept() of non-MPC client as fallback to TCP"). The new condition added by this commit was then not expected, and was in fact at the wrong place in v6.6: in case of issue, the problem would not have been reported correctly. ] Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>