style: 优化 == 及 != 表达式格式

1.将 null 或常量值调整到符号左侧
2.将无特殊意义的方法判空写法改为表达式判断写法

continew-admin-common/src/main/java/top/charles7c/cnadmin/common/handler/CrudRequestMappingHandlerMapping.java

@@ -41,7 +41,7 @@ public class CrudRequestMappingHandlerMapping extends RequestMappingHandlerMappi
     @Override
     protected RequestMappingInfo getMappingForMethod(@NonNull Method method, @NonNull Class<?> handlerType) {
         RequestMappingInfo requestMappingInfo = super.getMappingForMethod(method, handlerType);
-        if (requestMappingInfo == null) {
+        if (null == requestMappingInfo) {
             return null;
         }