[PATCH -next] ntfs: remove set but not used variable 'attr_len'

[YueHaibing]

Fixes gcc '-Wunused-but-set-variable' warning:

fs/ntfs/inode.c: In function 'ntfs_truncate':
fs/ntfs/inode.c:2357:6: warning:
 variable 'attr_len' set but not used [-Wunused-but-set-variable]

It is never use since introduction in
commit dd072330d1a6 ("NTFS: Implement fs/ntfs/inode.[hc]::ntfs_truncate().
It only supports       uncompressed and unencrypted files.")

Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 fs/ntfs/inode.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index fb1a2b49a5da..1c8b669e7a52 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -2354,7 +2354,6 @@ int ntfs_truncate(struct inode *vi)
        ATTR_RECORD *a;
        const char *te = "  Leaving file length out of sync with i_size.";
        int err, mp_size, size_change, alloc_change;
-       u32 attr_len;
 
        ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
        BUG_ON(NInoAttr(ni));
@@ -2728,7 +2727,6 @@ int ntfs_truncate(struct inode *vi)
         * this cannot fail since we are making the attribute smaller thus by
         * definition there is enough space to do so.
         */
-       attr_len = le32_to_cpu(a->length);
        err = ntfs_attr_record_resize(m, a, mp_size +
                        le16_to_cpu(a->data.non_resident.mapping_pairs_offset));
        BUG_ON(err);