gdbserial: Fix go vet warnings (#1594)
gdbserial: Fix go vet warnings (#1594)


go-delve/delve,aarzilli/delve,alexbrainman/delve,go-delve/delve,dr2chase/delve,derekparker/delve,alexbrainman/delve,go-delve/delve,aarzilli/delve,dr2chase/delve,go-delve/delve,derekparker/delve,aarzilli/delve,alexbrainman/delve,go-delve/delve,dr2chase/delve,aarzilli/delve,derekparker/delve