net/9p/trans_virtio.c: fix some spell mistakes in comments

Fix spelling mistake in comments of p9_virtio_zc_request().

Link: http://lkml.kernel.org/r/5B4EB7D9.9010108@huawei.comSigned-off-by: Jun Piao <piaojun@huawei.com>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>

net/9p/trans_virtio.c

@@ -382,8 +382,8 @@ static int p9_get_mapped_pages(struct virtio_chan *chan,
  * p9_virtio_zc_request - issue a zero copy request
  * @client: client instance issuing the request
  * @req: request to be issued
- * @uidata: user bffer that should be ued for zero copy read
- * @uodata: user buffer that shoud be user for zero copy write
+ * @uidata: user buffer that should be used for zero copy read
+ * @uodata: user buffer that should be used for zero copy write
  * @inlen: read buffer size
  * @outlen: write buffer size
  * @in_hdr_len: reader header size, This is the size of response protocol data