AU: consider inDesiredNameLength and protect against null input

[SamWindell]

We were not considering inDesiredNameLength, which I think is a problem if you have long module names in your CLAP.

Does this change look reasonable?

I will say that 2 months ago I got a report that I user had a crash in this function. I implemented this change and I have seen no further reports of this issue.

   ausdk::AUMethodGetProperty (/Users/runner/.cache/zig/p/N-V-__8AABXaAwCPe89grjjAXjcvmKwtSHo-0bx570E4IGYf/src/AudioUnitSDK/AUPlugInDispatch.cpp:157)
   ausdk::AUBase::DispatchGetProperty (/Users/runner/.cache/zig/p/N-V-__8AABXaAwCPe89grjjAXjcvmKwtSHo-0bx570E4IGYf/src/AudioUnitSDK/AUBase.cpp:627)
   free_audio::auv2_wrapper::WrapAsAUV2::CopyClumpName (/Users/runner/.cache/zig/p/N-V-__8AAI0aEAAgIOKJQmqSWnD9V2gBob6pqElBItNJFfsE/src/wrapasauv2.cpp:534)
   free_audio::auv2_wrapper::Clumps::getClump (/Users/runner/.cache/zig/p/N-V-__8AAI0aEAAgIOKJQmqSWnD9V2gBob6pqElBItNJFfsE/src/detail/auv2/auv2_base_classes.h:109)
   null (external-file)
   null (external-file)
   null (external-file)
   null (external-file)
   __ubsan_handle_type_mismatch_v1 (src/utils/debug/debug.cpp:235)
   HandleUbsanError (src/utils/debug/debug.cpp:81)

[defiantnerd]

Thanks, @SamWindell, well spotted. I will merge it when we solved the github builder issue

[baconpaul]

I've solved the GitHub issue; we just need to rebase next these prs.

git checkout next
git pull upstream next
git checkout my-branch
git rebase next my-branch
git push origin my-branch --force

is the common pattern if origin is set to your fork and upstream is set to free-audio/clap-wrapper