backend/x11: delete xcb conn check NULL
xcb_connect always returns a non-NULL pointer to a xcb_connection_t, even on failure.
Signed-off-by: Peng Liu liupeng01@kylinos.cn
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xcb_connect always returns a non-NULL pointer to a xcb_connection_t, even on failure.
Signed-off-by: Peng Liu liupeng01@kylinos.cn