xfsprogs: xfs_fsr: Interpret arguments of qsort's compare function correctly

xfsprogs: xfs_fsr: Interpret arguments of qsort's compare function correctly

The first argument passed to qsort() in fsrfs() is an array of "struct
xfs_bulkstat". Hence the two arguments to the cmp() function must be
interpreted as being of type "struct xfs_bulkstat *" as against "struct
xfs_bstat *" that is being used to currently typecast them.

Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>