添加github workflow，检查代码是否已经格式化 (#342)

* 添加github workflow，检查代码是否已经格式化

kernel/src/syscall/mod.rs

@@ -664,7 +664,6 @@ impl Syscall {
                         Ok(pipefd) => Self::pipe(pipefd),
                     },
                 }
-
             }
 
             SYS_UNLINK_AT => {

kernel/src/syscall/user_access.rs

@@ -327,7 +327,7 @@ impl<'a> UserBufferWriter<'a> {
         };
         return Ok(chunks);
     }
-    
+
     fn convert_one_with_offset<T>(src: &mut [u8], offset: usize) -> Result<&mut T, SystemError> {
         if offset + core::mem::size_of::<T>() > src.len() {
             return Err(SystemError::EINVAL);