selftests: futex: Fix 'the the' typo in comment

Replace 'the the' with 'the' in the comment.

Signed-off-by: Slark Xiao <slark_xiao@163.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20220725015903.5449-1-slark_xiao@163.com

tools/testing/selftests/futex/functional/futex_requeue_pi_signal_restart.c

@@ -184,7 +184,7 @@ int main(int argc, char *argv[])
 		/*
 		 * If res is non-zero, we either requeued the waiter or hit an
 		 * error, break out and handle it. If it is zero, then the
-		 * signal may have hit before the the waiter was blocked on f1.
+		 * signal may have hit before the waiter was blocked on f1.
 		 * Try again.
 		 */
 		if (res > 0) {