Merge commit 'refs/top-bases/gcc-missing-case' into gcc-missing-case

diff --cc lib/libzfs/libzfs_changelist.c
Simple merge

diff --cc lib/libzfs/libzfs_dataset.c
Simple merge

diff --cc module/zfs/spa.c
Simple merge

diff --cc module/zfs/vdev_label.c
Simple merge

diff --cc module/zfs/zfs_ioctl.c
Simple merge