[LEDE-DEV] [PATCH v3 04/13] scripts: $/${} is unnecessary on arithmetic variables

[Jo-Philipp Wich]

Hi,

removing the dollar signs lets expressions succeed which would otherwise
fail - which means it introduces a behavior change.

root at jj:~# ash -c 'echo $((undef1 + undef2))'
0
root at jj:~# ash -c 'echo $(($undef1 + $undef2))'
ash: arithmetic syntax error
root at jj:~#

~ Jo