Btrfs: check file pointer in btrfs_sync_file
fsync can be called by NFS with a null file pointer, and btrfs was
oopsing in this case.
Signed-off-by: 
Chris Mason <chris.mason@oracle.com>
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fsync can be called by NFS with a null file pointer, and btrfs was
oopsing in this case.
Signed-off-by: Chris Mason <chris.mason@oracle.com>