wait01: Use TST_EXP_FAIL2() for wait

Both wait() and waitpid() return PID, therefore (similarly as for file
descriptor) pass condition is >= 0, which is in TST_EXP_FAIL2().
Therefore TST_EXP_FAIL2() or TST_EXP_PID{,_SILENT} needs to be used.
Affected only wait01.

Link: https://lore.kernel.org/ltp/20240509144046.312245-1-pvorel@suse.cz/
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Petr Vorel <pvorel@suse.cz>

testcases/kernel/syscalls/wait/wait01.c

@@ -16,7 +16,7 @@
 
 static void verify_wait(void)
 {
-	TST_EXP_FAIL(wait(NULL), ECHILD);
+	TST_EXP_FAIL2(wait(NULL), ECHILD);
 }
 
 static struct tst_test test = {