[Bug 217532] sbin/newfs_nandfs/newfs_nandfs.c warning on unaligned pointer value

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217532

            Bug ID: 217532
           Summary: sbin/newfs_nandfs/newfs_nandfs.c warning on unaligned
                    pointer value
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: Trond.Endrestol at ximalas.info

Created attachment 180490
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180490&action=edit
Patch for sbin/newfs_nandfs/newfs_nandfs.c eliminating the unaligned pointer
value warning

sbin/newfs_nandfs/newfs_nandfs.c in 12.0-CURRENT r314649 throws a warning on
unaligned pointer value:

newfs_nandfs/newfs_nandfs.c:543:11: error: taking address of packed member
'f_uuid' of class or structure 'nandfs_fsdata' may result in an unaligned
pointer value [-Werror,-Waddress-of-packed-member]
        uuidgen(&fsdata.f_uuid, 1);
                 ^~~~~~~~~~~~~
1 error generated.
*** [newfs_nandfs.o] Error code 1

The attached patch fixes this error.

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