No need anymoe for bdrv_set_read_only

Signed-off-by: NNaphtali Sprei <nsprei@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

block.c

@@ -1011,13 +1011,6 @@ int bdrv_is_read_only(BlockDriverState *bs)
     return bs->read_only;
 }
 
-int bdrv_set_read_only(BlockDriverState *bs, int read_only)
-{
-    int ret = bs->read_only;
-    bs->read_only = read_only;
-    return ret;
-}
-
 int bdrv_is_sg(BlockDriverState *bs)
 {
     return bs->sg;

block.h

@@ -147,7 +147,6 @@ int bdrv_get_type_hint(BlockDriverState *bs);
 int bdrv_get_translation_hint(BlockDriverState *bs);
 int bdrv_is_removable(BlockDriverState *bs);
 int bdrv_is_read_only(BlockDriverState *bs);
-int bdrv_set_read_only(BlockDriverState *bs, int read_only);
 int bdrv_is_sg(BlockDriverState *bs);
 int bdrv_enable_write_cache(BlockDriverState *bs);
 int bdrv_is_inserted(BlockDriverState *bs);