NFS: Clean-up: use correct type when converting NFS blocks to local blocks

inode->i_blocks is a blkcnt_t these days, which can be a u64 or unsigned
long, depending on the setting of CONFIG_LSF.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index ad2b40d..76cf55d 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -183,9 +183,9 @@
 /*
  * Calculate the number of 512byte blocks used.
  */
-static inline unsigned long nfs_calc_block_size(u64 tsize)
+static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 {
-	loff_t used = (tsize + 511) >> 9;
+	blkcnt_t used = (tsize + 511) >> 9;
 	return (used > ULONG_MAX) ? ULONG_MAX : used;
 }