Fix props warning, close #2253

https://fb.me/react-unknown-prop

components/affix/index.jsx

@@ -123,8 +123,12 @@ export default class Affix extends React.Component {
       'ant-affix': this.state.affixStyle,
     });
 
+    const props = { ...this.props };
+    delete props.offsetTop;
+    delete props.offsetBottom;
+
     return (
-      <div {...this.props}>
+      <div {...props}>
         <div className={className} ref="fixedNode" style={this.state.affixStyle}>
           {this.props.children}
         </div>

components/layout/col.jsx

@@ -14,6 +14,7 @@ export default function Col(props) {
     } else if (typeof props[size] === 'object') {
       sizeProps = props[size] || {};
     }
+    delete others[size];
     sizeClassObj = {
       ...sizeClassObj,
       [`ant-col-${size}-${sizeProps.span}`]: sizeProps.span !== undefined,