iw: 'idby' might be used uninitialized in main function

iw: 'idby' might be used uninitialized in main function

During static-analysis of the code, a message appeared stating that
'idby' enum might be used un-initialized.
It described a case in which the 'goto detect' statment occurred and
that means that the enum initialization will be skipped.

Johannes: just move the initialization after the label, instead
of moving the variable as Omer's patch had it since we always
just want it to be II_NONE to start with and don't need it in
any other scope.

Signed-off-by: Omer Dagan <omer.dagan@tandemg.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>