um: fix error return code in winch_tramp()

Fix to return a negative error code from the error handling case instead
of 0, as done elsewhere in this function.

Fixes: 89df6bfc04 ("uml: DEBUG_SHIRQ fixes")
Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Zhen Lei <[email protected]>
Acked-By: [email protected]
Signed-off-by: Richard Weinberger <[email protected]>

arch/um/drivers/chan_user.c

@@ -256,7 +256,8 @@ static int winch_tramp(int fd, struct tty_port *port, int *fd_out,
 		goto out_close;
 	}
 
-	if (os_set_fd_block(*fd_out, 0)) {
+	err = os_set_fd_block(*fd_out, 0);
+	if (err) {
 		printk(UM_KERN_ERR "winch_tramp: failed to set thread_fd "
 		       "non-blocking.\n");
 		goto out_close;