xfsprogs: use "unsigned short" instead of ushort

xfsprogs: use "unsigned short" instead of ushort

Android's bionic libc doesn't define ushort.  There isn't a real
benefit (other than perhaps conciseness) to use ushort over "unsigned
short", and it's only used in a handful of files in xfsprogs.  So
change over to using unsigned short everywhere.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>