iwlwifi: mvm: remove redundant assignment to variable ret

The variable ret is being assigned with a value that is never read
and it is being updated later with a new value. The initialization is
redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200420222449.99481-1-colin.king@canonical.comSigned-off-by: Luca Coelho <luciano.coelho@intel.com>

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

@@ -603,7 +603,7 @@ static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 				     struct iwl_lq_sta *lq_data, u8 tid,
 				     struct ieee80211_sta *sta)
 {
-	int ret = -EAGAIN;
+	int ret;
 
 	IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 		     sta->addr, tid);