io_uring/net: initialize struct msghdr more sanely for io_recv()

We only need to clear the input fields on the first invocation, not
when potentially doing a retry.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/net.c

@@ -860,6 +860,14 @@ int io_recv(struct io_kiocb *req, unsigned int issue_flags)
 	if (unlikely(!sock))
 		return -ENOTSOCK;
 
+	msg.msg_name = NULL;
+	msg.msg_namelen = 0;
+	msg.msg_control = NULL;
+	msg.msg_get_inq = 1;
+	msg.msg_controllen = 0;
+	msg.msg_iocb = NULL;
+	msg.msg_ubuf = NULL;
+
 retry_multishot:
 	if (io_do_buffer_select(req)) {
 		void __user *buf;
@@ -874,14 +882,7 @@ int io_recv(struct io_kiocb *req, unsigned int issue_flags)
 	if (unlikely(ret))
 		goto out_free;
 
-	msg.msg_name = NULL;
-	msg.msg_namelen = 0;
-	msg.msg_control = NULL;
-	msg.msg_get_inq = 1;
 	msg.msg_flags = 0;
-	msg.msg_controllen = 0;
-	msg.msg_iocb = NULL;
-	msg.msg_ubuf = NULL;
 
 	flags = sr->msg_flags;
 	if (force_nonblock)