vstart.sh: align add/minus shell var usage

Signed-off-by: Changcheng Liu <changcheng.liu@intel.com>

diff --git a/src/vstart.sh b/src/vstart.sh
index 427710413de5447bfcd5871b9756fca599faa2a5..c17e19ccf1ffb7fa11c84514014f78e76a65a756 100755 (executable)
--- a/src/vstart.sh
+++ b/src/vstart.sh
@@ -738,7 +738,7 @@ EOF
 }
 
 start_osd() {
-    for osd in `seq 0 $((CEPH_NUM_OSD-1))`
+    for osd in `seq 0 $(($CEPH_NUM_OSD-1))`
     do
            if [ "$new" -eq 1 ]; then
                    wconf <<EOF