MDEV-11520 Properly retry posix_fallocate() on EINTR

We only want to retry posix_fallocate() on EINTR as long as the system
is not being shut down. We do not want to retry on any other (hard) error.

Thanks to Jocelyn Fournier for quickly noticing the mistake in my
previous commit.

storage/innobase/fil/fil0fil.cc

@@ -3866,7 +3866,8 @@ fil_ibd_create(
 	int	ret;
 	do {
 		ret = posix_fallocate(file, 0, size * UNIV_PAGE_SIZE);
-	} while (ret != 0 && ret != EINTR);
+	} while (ret == EINTR
+		 && srv_shutdown_state == SRV_SHUTDOWN_NONE);
 
 	if (ret == 0) {
 		success = true;