Fix the following bug.

  ================================
  # btrfs device scan -- /dev/sdb
  ERROR: not a block device: --
  ================================

It should work as follow.

  ================================
  # ./btrfs device scan -- /dev/sdb
  Scanning for Btrfs filesystems in '/dev/sdb'
  ================================

Signed-off-by: Satoru Takeuchi <takeuchi_sat...@jp.fujitsu.com>
---
This patch can be applied to devel (commit: 5d038a7ed212)
---
 cmds-device.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cmds-device.c b/cmds-device.c
index 94ffdc5..e500638 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -246,7 +246,7 @@ static const char * const cmd_device_scan_usage[] = {
 static int cmd_device_scan(int argc, char **argv)
 {
        int i;
-       int devstart = 1;
+       int devstart;
        int all = 0;
        int ret = 0;

@@ -269,6 +269,7 @@ static int cmd_device_scan(int argc, char **argv)
                        usage(cmd_device_scan_usage);
                }
        }
+       devstart = optind;

        if (all && check_argc_max(argc - optind, 1))
                usage(cmd_device_scan_usage);
-- 
2.5.0
--
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