airo: return from set_wep_key() when key length is zero
Even if keylen == 0 is a bug and should not really happen, better avoid possibility of passing bad value to firmware. Signed-off-by: NStanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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