iwlwifi: mvm: return the actual error code when switch_vif_chanctx fails

We have code to recover and go back to the original channel context if
something fails in the middle of switch_vif_chanctx, but we return the
error code of the recover calls instead of the original code, so if
the recovery succeeds, we will return 0 (success).  Fix this by not
assigning the return value of the recovery calls to ret.
Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>

drivers/net/wireless/iwlwifi/mvm/mac80211.c

@@ -2988,15 +2988,13 @@ iwl_mvm_switch_vif_chanctx_swap(struct iwl_mvm *mvm,
 	__iwl_mvm_remove_chanctx(mvm, vifs[0].new_ctx);
 
 out_reassign:
-	ret = __iwl_mvm_add_chanctx(mvm, vifs[0].old_ctx);
-	if (ret) {
+	if (__iwl_mvm_add_chanctx(mvm, vifs[0].old_ctx)) {
 		IWL_ERR(mvm, "failed to add old_ctx back after failure.\n");
 		goto out_restart;
 	}
 
-	ret = __iwl_mvm_assign_vif_chanctx(mvm, vifs[0].vif, vifs[0].old_ctx,
-					   true);
-	if (ret) {
+	if (__iwl_mvm_assign_vif_chanctx(mvm, vifs[0].vif, vifs[0].old_ctx,
+					 true)) {
 		IWL_ERR(mvm, "failed to reassign old_ctx after failure.\n");
 		goto out_restart;
 	}