fix several clippy complexity warnings #800
Merged
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A first step towards making clippy complain less: this PR removes unnecessary casts to the same type, unused lifetimes, changes
#cfg(all(feature = "audio"))]
to#[cfg(feature = "audio")]
and!CONTEXT.is_none()
toCONTEXT.is_some()
.I have not focused on the
style
clippy warnings, as they are often personal preferences, so the changes in this PR should be trivial simplifications only.