lib: Fix bug in tst_test metadata validation

The results pointer is NULL when do_setup() checks tst_test metadata
validity. Print the invalid runtime value from the correct pointer.

Link: https://lore.kernel.org/ltp/20250408140944.36020-1-mdoucha@suse.cz/
Fixes: a6a369c ("lib: redefine the overall timeout logic of test")
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Martin Doucha <mdoucha@suse.cz>

Author: mdoucha

lib/tst_test.c

@@ -1267,10 +1267,8 @@ static void do_setup(int argc, char *argv[])
 			tst_test->timeout);
 	}
 
-	if (tst_test->runtime < 0) {
-		tst_brk(TBROK, "Invalid runtime value %i",
-			results->runtime);
-	}
+	if (tst_test->runtime < 0)
+		tst_brk(TBROK, "Invalid runtime value %i", tst_test->runtime);
 
 	if (tst_test->tconf_msg)
 		tst_brk(TCONF, "%s", tst_test->tconf_msg);