[ruby-core:119201] [Ruby master Bug#20743] ruby doesn't properly split RUBY_DEBUG_LOG_FILTER into items

Issue #20743 has been reported by x-yuri (Yuri Kanivetsky).

----------------------------------------
Bug #20743: ruby doesn't properly split RUBY_DEBUG_LOG_FILTER into items
https://bugs.ruby-lang.org/issues/20743

* Author: x-yuri (Yuri Kanivetsky)
* Status: Open
* ruby -v: ruby 3.4.0dev (2024-09-15T01:06:11Z master 532af89e3b) +PRISM [x86_64-linux-musl]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
```
$ docker run --rm alpine:3.20.3 sh -euxc '
    apk add git build-base autoconf ruby yaml-dev zlib-dev openssl-dev libffi-dev
    git clone https://github.com/ruby/ruby
    cd ruby
    git checkout 532af89e3b5b78dd3a6fe29c6cc64ad1b073afe2
    ./autogen.sh
    ./configure cflags=-DUSE_RUBY_DEBUG_LOG --disable-install-doc
    make -j8 install
    ruby -v
    RUBY_DEBUG_LOG=stderr RUBY_DEBUG_LOG_FILTER=rb_thread_schedule_limits,rb_ractor_thread_switch ruby -e ""
'
...
+ RUBY_DEBUG_LOG=stderr RUBY_DEBUG_LOG_FILTER=rb_thread_schedule_limits,rb_ractor_thread_switch ruby -e     
RUBY_DEBUG_LOG=stderr [stderr]                                                                                                               
RUBY_DEBUG_LOG_FILTER[0]=rb_thread_schedule_limit (all)                                                                                      
RUBY_DEBUG_LOG_FILTER[1]=rb_ractor_thread_switch (all)
...
```

As you can see `ruby` reports that `RUBY_DEBUG_LOG_FILTER[0]` equals `rb_thread_schedule_limit`, not `rb_thread_schedule_limits`.

This happens because here:
https://github.com/ruby/ruby/blob/532af89e3b5b78dd3a6fe29c6cc64ad1b073afe2/debug.c#L353
`1` should not be subtracted.

Also in the following lines `str` is increased, but `len` is not decreased. It makes sense to recheck if there are no further mistakes.



-- 
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