MFC r351382 (by delphij):

When creating a new FAT32 filesystem, use "unknown" (0xFFFFFFFF) for
FSI_Nxt_Free instead of providing a wrong value.

With this change, fsck_msdosfs would no longer complain about invalid
FSInfo information.

MFC r355317 (by delphij):

newfs_msdos: -A is incompatible with -r, not -o.

PR: 242314
Submitted by: Guy Yur <guyyur gmail com>

MFC r357227:

Merge r357225 from the clang1000-import branch:

Fix the following -Werror warning from clang 10.0.0 in newfs_msdos:

sbin/newfs_msdos/newfs_msdos.c:181:2: error: misleading indentation; statement is not part of the previous 'if' [-Werror,-Wmisleading-indentation]

if (o.align) {
^

sbin/newfs_msdos/newfs_msdos.c:179:5: note: previous statement is here

if (argc < 1 || argc > 2)
^