[PATCH] uml: return a real error code

do_aio used to return -1 on error instead of errno.
Signed-off-by: NJeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/um/os-Linux/aio.c

@@ -117,6 +117,8 @@ static int do_aio(aio_context_t ctx, struct aio_context *aio)
         err = io_submit(ctx, 1, &iocbp);
         if(err > 0)
                 err = 0;
+	else
+		err = -errno;
 
  out:
         return err;