FreeBSD: unbreak compilation on i386

tests/zfs-tests/cmd/mmap_seek.c: use correct printf specifier
module/zfs/vdev.c: vdev_clear(): correctly cast argument to
atomic_add_64().

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Martin Matuska <mm@FreeBSD.org>
Closes openzfs#18096

Author: mmatuska

module/zfs/vdev.c

@@ -4674,7 +4674,7 @@ vdev_clear(spa_t *spa, vdev_t *vd)
 	vd->vdev_stat.vs_checksum_errors = 0;
 	vd->vdev_stat.vs_dio_verify_errors = 0;
 	vd->vdev_stat.vs_slow_ios = 0;
-	atomic_store_64(&vd->vdev_outlier_count, 0);
+	atomic_store_64((volatile uint64_t *)&vd->vdev_outlier_count, 0);
 	vd->vdev_read_sit_out_expire = 0;
 
 	for (int c = 0; c < vd->vdev_children; c++)

tests/zfs-tests/cmd/mmap_seek.c

@@ -47,6 +47,27 @@
 #endif
 
 static void
+seek_expect(int fd, off_t offset, int whence, off_t expect_offset)
+{
+	errno = 0;
+#if defined(SEEK_HOLE) && defined(SEEK_DATA)
+	off_t seek_offset = lseek(fd, offset, whence);
+	if (seek_offset == expect_offset)
+		return;
+
+	int err = errno;
+	fprintf(stderr, "lseek(fd, %jd, SEEK_%s) = %jd (expected %jd)",
+	    offset, (whence == SEEK_DATA ? "DATA" : "HOLE"),
+	    seek_offset, expect_offset);
+	if (err != 0)
+		fprintf(stderr, " (errno %d [%s])\n", err, strerror(err));
+	else
+		fputc('\n', stderr);
+#endif
+	exit(2);
+}
+
+static inline void
 seek_data(int fd, off_t offset, off_t expected)
 {
 #if defined(SEEK_HOLE) && defined(SEEK_DATA)