[PATCH] zbd: fixup ->zone_size_log2 if zone size is not power of 2

[Alexey Dobriyan <adobriyan@xxxxxxxxx>]

Code like this doesn't work if log2 is 0xffffffff.

	if (f->zbd_info->zone_size_log2 > 0)
                zone_idx = offset >> f->zbd_info->zone_size_log2;
        else
                zone_idx = offset / f->zbd_info->zone_size;

Other than that everything else works!

Signed-off-by: Alexey Dobriyan (SK hynix) <adobriyan@xxxxxxxxx>
---

 zbd.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/zbd.c
+++ b/zbd.c
@@ -393,7 +393,7 @@ static int init_zone_info(struct thread_data *td, struct fio_file *f)
 	f->zbd_info = zbd_info;
 	f->zbd_info->zone_size = zone_size;
 	f->zbd_info->zone_size_log2 = is_power_of_2(zone_size) ?
-		ilog2(zone_size) : -1;
+		ilog2(zone_size) : 0;
 	f->zbd_info->nr_zones = nr_zones;
 	pthread_mutexattr_destroy(&attr);
 	return 0;
@@ -510,7 +510,7 @@ static int parse_zone_info(struct thread_data *td, struct fio_file *f)
 	f->zbd_info = zbd_info;
 	f->zbd_info->zone_size = zone_size;
 	f->zbd_info->zone_size_log2 = is_power_of_2(zone_size) ?
-		ilog2(zone_size) : -1;
+		ilog2(zone_size) : 0;
 	f->zbd_info->nr_zones = nr_zones;
 	zbd_info = NULL;
 	ret = 0;