cmd: Use parenthesis around complex macro
cmd: Use parenthesis around complex macro

checkpatch emits error:

    ERROR: Macros with complex values should be enclosed in parentheses

Safeguard macro by use of parenthesis.

Signed-off-by: Tobin C. Harding <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@tobin.cc>

caglar10ur/lxc,hallyn/lxc,caglar10ur/lxc,ss1h2a3tw/lxc,ss1h2a3tw/lxc,hallyn/lxc,ss1h2a3tw/lxc,hallyn/lxc,caglar10ur/lxc