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>