[PATCH xserver] Xext/shm: Downgrade from error to debug log output about success

[Adam Jackson]

On Mon, 2018-03-12 at 15:12 +0300, Alexander Volkov wrote:
> Signed-off-by: Alexander Volkov <a.volkov at rusbitech.ru>

remote: I: patch #209879 updated using rev d36128a72acac4d54813c52c93efefad2dc9af41.
remote: I: 1 patch(es) updated to state Accepted.
To ssh://git.freedesktop.org/git/xorg/xserver
   319af6f471..d36128a72a  master -> master

- ajax