be2net: remove desc field from be_eq_obj

The event queue description (be_eq_obj.desc) field is used only to format
string for IRQ name and it is not really needed to hold this value.
Remove it and use local variable to format string for IRQ name.

Signed-off-by: Ivan Vecera <cera@cera.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>