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Add additional testing for void global functions. The tests ensure that calls to void global functions properly keep R0 invalid. Also make sure that exception callbacks still require a return value. Acked-by: Eduard Zingerman <eddyz87@gmail.com> Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com> Link: https://lore.kernel.org/r/20260228184759.108145-6-emil@etsalapatis.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>