the btrfs device scan usage didnt publish --all-devices
option so add it

Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
 cmds-device.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/cmds-device.c b/cmds-device.c
index 9e7328b..c94fcd5 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -178,7 +178,7 @@ static int cmd_rm_dev(int argc, char **argv)
 }
 
 static const char * const cmd_scan_dev_usage[] = {
-       "btrfs device scan [<device>...]",
+       "btrfs device scan [<--all-devices>|<device> [<device>...]]",
        "Scan devices for a btrfs filesystem",
        NULL
 };
-- 
1.7.7.6

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