libext2fs: use ext2fs_punch() to truncate quota file

Use the new ext2fs_punch() call to truncate the quota file.  This also
eliminates the need to fix it to work with bigalloc.

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
1 file changed