[ruby-core:115264] [Ruby master Bug#19754] `IO::Buffer#get_string` raises unsuitable exception for too large offset

Issue #19754 has been updated by usa (Usaku NAKAMURA).

Backport changed from 3.0: DONTNEED, 3.1: REQUIRED, 3.2: DONE to 3.0: DONTNEED, 3.1: DONE, 3.2: DONE

ruby_3_1 4f7b595815bd75706c276b03c8d445748e869f2e merged revision(s) 19346c2336053b351673da030b00c704138252d8.

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Bug #19754: `IO::Buffer#get_string` raises unsuitable exception for too large offset
https://bugs.ruby-lang.org/issues/19754#change-105180

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
* Backport: 3.0: DONTNEED, 3.1: DONE, 3.2: DONE
----------------------------------------
The message seems suitable when both of `offset` and `length` are given.
```ruby
IO::Buffer.for("test").get_string(5, 0) #=> Specified offset+length exceeds buffer size! (ArgumentError)
```

But without `length`, it doesn't seem to check `offset` properly.


```ruby
IO::Buffer.for("test").get_string(5) #=> negative string size (or size too big) (ArgumentError)
```

https://github.com/ruby/ruby/pull/8016



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