bugfix: append new parameters to ngx_http_lua_ffi_balancer_set_curren… #2332
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…t_peer at function end.
Avoid inserting new parameters in the middle of the function to prevent core
dumps when using old lua-resty-core with new lua-nginx-module.
Example stack trace:
```
Message: Process 1414245 (nginx) of user 1000 dumped core.
Stack trace of thread 1414245:
#0 0x00007ff596938285 __strlen_avx2 (libc.so.6 + 0x162285)
openresty#1 0x00007ff596f623d2 lj_cf_ffi_string (libluajit-5.1.so.2 + 0x523d2)
openresty#2 0x00007ff596f1bb4b lj_BC_FUNCC (libluajit-5.1.so.2 + 0xbb4b)
openresty#3 0x00007ff596f74223 lua_pcall (libluajit-5.1.so.2 + 0x64223)
openresty#4 0x00000000005044b7 n/a (/home/jiahao/work/org/lua-resty-core/work/nginx/sbin/nginx + 0x1044b7)
```
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…t_peer at function end.
Avoid inserting new parameters in the middle of the function to prevent core dumps when using old lua-resty-core with new lua-nginx-module.
Example stack trace:
I hereby granted the copyright of the changes in this pull request
to the authors of this lua-nginx-module project.