tty/ldsem: Fix syntax errors in comments

Delete the redundant word 'are'.
Signed-off-by: NXiang wangx <wangxiang@cdjrlc.com>
Link: https://lore.kernel.org/r/20211208142036.7956-1-wangxiang@cdjrlc.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/tty_ldsem.c

@@ -163,7 +163,7 @@ down_read_failed(struct ld_semaphore *sem, long count, long timeout)
 
 	/*
 	 * Try to reverse the lock attempt but if the count has changed
-	 * so that reversing fails, check if there are are no waiters,
+	 * so that reversing fails, check if there are no waiters,
 	 * and early-out if not
 	 */
 	do {