Enum conversion: fix loop variable captured in closure #2298
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When iterating over the btf types, the loop variable was captured in the getter() closure. This caused enumSetter() to use the wrong btf type to get the enum value.
To avoid this problem, this patch makes sure that the closures use a copy of the loop variable.
Fixes: dcf979c
Problem discovered when trying to implement enums in the dns gadget: #2204 (comment)