iwlwifi: mvm: d3: missing unlock in iwl_mvm_wowlan_program_keys()

This code was refactored and the mutex_unlock(&mvm->mutex); was
accidentally deleted.

Fixes: af3aab9c ("iwlwifi: mvm: d3: make key reprogramming iteration optional")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Luca Coelho <luca@coelho.fi>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210831081849.GB9846@kili

drivers/net/wireless/intel/iwlwifi/mvm/d3.c

@@ -160,6 +160,7 @@ static void iwl_mvm_wowlan_program_keys(struct ieee80211_hw *hw,
 		mvm->ptk_icvlen = key->icv_len;
 		mvm->gtk_ivlen = key->iv_len;
 		mvm->gtk_icvlen = key->icv_len;
+		mutex_unlock(&mvm->mutex);
 
 		/* don't upload key again */
 		return;