xfsprogs: don't shadow global libxfs_init x variable

xfsprogs: don't shadow global libxfs_init x variable

We use the variable 'x' for the global libxfs_init structure, but several
other functions think 'x' is a nice convenient local var too, and sparse
complains.  Rename these local variables (or in some cases re-use existing
loop counter vars when x was used for this purpose).

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>