Remove unnecessary wallet finds (ethereum#341)

* Remove unnecessary wallet finds

* Prevent repetitive finds

* Remove unused variable message

* Move var declarations to outside the loop

abe/abe.go

@@ -74,13 +74,16 @@ func sendSms(phoneNumber string, message string, account common.Address, issuer
 
 func SendAttestationMessages(receipts []*types.Receipt, block *types.Block, coinbase common.Address, accountManager *accounts.Manager, verificationServiceURL string) {
 	account := accounts.Account{Address: coinbase}
-	wallet, walletErr := accountManager.Find(account)
-
+	var wallet accounts.Wallet
+	var err error
 	for _, receipt := range receipts {
 		for _, request := range receipt.AttestationRequests {
-			if walletErr != nil {
-				log.Error("[Celo] Failed to get account for sms attestation", "err", walletErr)
-				return
+			if wallet == nil {
+				wallet, err = accountManager.Find(account)
+				if err != nil {
+					log.Error("[Celo] Failed to get account for sms attestation", "err", err)
+					return
+				}
 			}
 
 			if !bytes.Equal(coinbase.Bytes(), request.Verifier.Bytes()) {