kselftest/arm64: Don't repeat termination handler for fp-stress

When fp-stress gets a termination signal it sets a flag telling itself to
exit and sends a termination signal to all the children. If the flag is set
then don't bother repeating this process, it isn't going to accomplish
anything other than consume CPU time which can be an issue when running in
emulation.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220921181345.618085-2-broonie@kernel.orgSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

tools/testing/selftests/arm64/fp/fp-stress.c

@@ -255,6 +255,10 @@ static void handle_exit_signal(int sig, siginfo_t *info, void *context)
 {
 	int i;
 
+	/* If we're already exiting then don't signal again */
+	if (terminate)
+		return;
+
 	ksft_print_msg("Got signal, exiting...\n");
 
 	terminate = true;