Provide second argument to validator.error with bind:checked errors

src/validate/html/validateElement.js

@@ -25,7 +25,7 @@ export default function validateElement ( validator, node ) {
 				}
 
 				if ( getType( validator, node ) !== 'checkbox' ) {
-					validator.error( `'checked' binding can only be used with <input type="checkbox">` );
+					validator.error( `'checked' binding can only be used with <input type="checkbox">`, attribute.start );
 				}
 			}
 
@@ -99,4 +99,4 @@ function getType ( validator, node ) {
 function list ( items, conjunction = 'or' ) {
 	if ( items.length === 1 ) return items[0];
 	return `${items.slice( 0, -1 ).join( ', ' )} ${conjunction} ${items[ items.length - 1 ]}`;
-}
+}