Fix listen_sockets overflow in close_network_connections()
==32610==ERROR: AddressSanitizer: global-buffer-overflow on address 0x000000f4f6a8 at pc 0x000000533bd6 bp 0x7ffeafc6f390 sp 0x7ffeafc6f388
READ of size 8 at 0x000000f4f6a8 thread T0
#0 0x533bd5 in io_del /home/runner/work/tinc/tinc/openssl3/../src/linux/event.c:104:9
#1 0x4f4808 in close_network_connections /home/runner/work/tinc/tinc/openssl3/../src/net_setup.c:1283:3
#2 0x4cea70 in main /home/runner/work/tinc/tinc/openssl3/../src/tincd.c:717:2
#3 0x7f493a1d3d8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)
#4 0x7f493a1d3e3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e3f)
#5 0x421ac4 in _start (/home/runner/work/tinc/tinc/openssl3/src/tincd+0x421ac4)
0x000000f4f6a8 is located 8 bytes to the right of global variable 'listen_socket' defined in '../src/net_socket.c:48:17' (0xf4f0e0) of size 1472
SUMMARY: AddressSanitizer: global-buffer-overflow /home/runner/work/tinc/tinc/openssl3/../src/linux/event.c:104:9 in io_del
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