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Convert MCTP socket's getsockopt implementation to use the new getsockopt_iter callback with sockopt_t. Key changes: - Replace (char __user *optval, int __user *optlen) with sockopt_t *opt - Use opt->optlen for buffer length (input) - Use copy_to_iter() instead of copy_to_user() - Add linux/uio.h for copy_to_iter() Signed-off-by: Breno Leitao <leitao@debian.org> Link: https://patch.msgid.link/20260507-getsock_two-v2-1-5873111d9c12@debian.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>