wlan: Return an error code in case of invalid seq_len while adding key

There is no return statement in case of invalid sequence length in
__wlan_hdd_cfg80211_add_key api.

Return an error code in case of invalid seq_len.

Issue: SEC-1245
CRs-Fixed: 2153553
(adapted from commit https://source.codeaurora.org/quic/la/platform/vendor/qcom-opensource/wlan/prima
5a0eeb72c3cde7dcb8096967561a88a678ad9aec)
Signed-off-by: Gururaj Patil <gururaj.patil3@harman.com>
Change-Id: I10e1f5c193605dd76fa62b25e57f7957c19be373
1 file changed