snabb top: handle devices that do not specify speed
snabb top: handle devices that do not specify speed

(cherry picked from commit 85428eab2214562db3b7b96dec4c71e3eb678ca5)

eugeneia/snabb,Igalia/snabb,snabbco/snabb,snabbco/snabb,snabbco/snabb,SnabbCo/snabbswitch,snabbco/snabb,Igalia/snabb,eugeneia/snabb,SnabbCo/snabbswitch,SnabbCo/snabbswitch,Igalia/snabb,snabbco/snabb,eugeneia/snabb,eugeneia/snabb,eugeneia/snabb,Igalia/snabb,eugeneia/snabb,SnabbCo/snabbswitch,Igalia/snabb,eugeneia/snabb,snabbco/snabb,eugeneia/snabb,snabbco/snabb,snabbco/snabb,Igalia/snabb,Igalia/snabb,Igalia/snabb