block: Do not export bdrv_first

The bdrv_first linked list of BlockDriverStates is currently extern so
that block migration can iterate the list.  However, since there is
already a bdrv_iterate() function there is no need to expose bdrv_first.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/block.c b/block.c
index ed4c819f0..61da18365 100644
--- a/block.c
+++ b/block.c
@@ -55,7 +55,7 @@ static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                          const uint8_t *buf, int nb_sectors);
 
-BlockDriverState *bdrv_first;
+static BlockDriverState *bdrv_first;
 
 static BlockDriver *first_drv;