fix(c4-117-g15): require() or revert() statements that check input arguments should be at the

top of the function

Signed-off-by: Tomás Migone <[email protected]>

Author: tmigone

contracts/gateway/L1GraphTokenGateway.sol

@@ -203,8 +203,8 @@ contract L1GraphTokenGateway is Initializable, GraphTokenGateway, L1ArbitrumMess
         bytes calldata _data
     ) external payable override notPaused returns (bytes memory) {
         IGraphToken token = graphToken();
-        require(_l1Token == address(token), "TOKEN_NOT_GRT");
         require(_amount != 0, "INVALID_ZERO_AMOUNT");
+        require(_l1Token == address(token), "TOKEN_NOT_GRT");
         require(_to != address(0), "INVALID_DESTINATION");
 
         // nested scopes to avoid stack too deep errors