[Suggestion] drivers/block/aoe: using uninitialized variable.

[Chen Gang <gang.chen@asianux.com>]

Hello Ed L. Cashin

  when compiling with EXTRA_CFLAGS=-W

  get the warning:
    drivers/block/aoe/aoecmd.c:931:20: warning: ‘bv’ is used uninitialized in this function [-Wuninitialized]

  bv is really not initialized.
    (and it seems only set "buf->bv_resid = 0" is not enough).

  thanks.

gchen.

 919 static void
 920 bufinit(struct buf *buf, struct request *rq, struct bio *bio)
 921 {
 922         struct bio_vec *bv;
 923 
 924         memset(buf, 0, sizeof(*buf));
 925         buf->rq = rq;
 926         buf->bio = bio;
 927         buf->resid = bio->bi_size;
 928         buf->sector = bio->bi_sector;
 929         bio_pageinc(bio);
 930         buf->bv = bio_iovec(bio);
 931         buf->bv_resid = bv->bv_len;
 932         WARN_ON(buf->bv_resid == 0);
 933 }