[PATCH] uml: Correct the failure path in start_io_thread

Correct the failure path in start_io_thread(), to return the correct error
code.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/drivers/ubd_user.c

@@ -350,6 +350,7 @@ int start_io_thread(unsigned long sp, int *fd_out)
 		    NULL);
 	if(pid < 0){
 		printk("start_io_thread - clone failed : errno = %d\n", errno);
+		err = -errno;
 		goto out_close;
 	}