The namelen is of type int. It shouldn't be made size_t which is
unsigned. The signed number is needed for error checking before use.

Fixes: c5597802 ("io_uring/net: move receive multishot out of the generic msghdr path")
Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Link: https://lore.kernel.org/r/20240301144349.2807544-1-usama.anjum@collabora.comSigned-off-by: Jens Axboe <axboe@kernel.dk>