alloc_inode() initializes i_nlink to 1.  Remove unnecessary
re-initialization.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
CC: Joel Becker <jlbec@evilplan.org>
CC: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>