a concern is going, or it is not. a concern cannot have a going concern (although perhaps a concern can own another concern, or perhaps several concerns). see the rest of the comments for discussion on the use of the phrase 'going concern'.
in this case, toshiba is concerned it has stopped becoming a going concern.
Advanced HN users think Toshiba is mainly a laptop vendor, confused about use of phrase 'going concern', too lazy to google same.