Memory leak in in coio_connect_timeout #10482
Description
Found by ASAN.
It is easier to demonstrate using ASAN. Reproducer:
local net = require('net.box')
net.connect(777) $ ./build-asan-debug/src/tarantool test.lua
=================================================================
==437649==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 76 byte(s) in 1 object(s) allocated from:
#0 0x5a240d91c349 in malloc (/home/shiny/dev/tarantool/build-asan-debug/src/tarantool+0x1256349) (BuildId: cf86baf56ac08c441fd7e98ccd34d38f9f70bc00)
#1 0x7f65acf55767 in generate_addrinfo /usr/src/debug/glibc/glibc/nss/getaddrinfo.c:1081:16
#2 0x7f65acf55767 in gaih_inet /usr/src/debug/glibc/glibc/nss/getaddrinfo.c:1199:12
#3 0x7f65acf55767 in getaddrinfo /usr/src/debug/glibc/glibc/nss/getaddrinfo.c:2391:12
#4 0x5a240d8d38d9 in getaddrinfo.part.0 asan_interceptors.cpp.o
#5 0x5a240ed8fccb in getaddrinfo_cb /home/shiny/dev/tarantool/src/lib/core/coio_task.c:327:13
#6 0x5a240ed8a06a in coio_on_feed /home/shiny/dev/tarantool/src/lib/core/coio_task.c:163:16
#7 0x5a240fd55430 in eio_execute /home/shiny/dev/tarantool/third_party/libeio/eio.c:2015:9
#8 0x5a240fd4f878 in etp_proc /home/shiny/dev/tarantool/third_party/libeio/etp.c:373:7
#9 0x5a240d853156 in asan_thread_start(void*) asan_interceptors.cpp.o
SUMMARY: AddressSanitizer: 76 byte(s) leaked in 1 allocation(s).
Note that repro is done with #10207 applied but coio_connect_timeout() fixes reverted.
Introduced in 2.10.0-beta1-222-g97457a399d.