net: qmi_wwan: simplify a check in qmi_wwan_bind()

This code is easier to read if we specify which flags we want at the
condition instead of at the top of the function.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>