added missing call to xcb_connect()
(cherry picked from commit dc2fb323ee11f081d447605be151024f9e2487f9)
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				|  | @ -615,6 +615,7 @@ display_exists_p (int number) | |||
| 		return FALSE; | ||||
|      | ||||
|     sprintf (buf, ":%d", number); | ||||
|     conn = xcb_connect(buf, NULL); | ||||
|     if (xcb_connection_has_error(conn)) return FALSE; | ||||
| 	 | ||||
|     xcb_disconnect(conn); | ||||
|  |  | |||
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