fix clippy warning

```
error: this lifetime isn't used in the impl
--> src/passthrough/mod.rs:139:6
|
139| impl<'a> InodeData {
| ^^
|
= note: `-D clippy::extra-unused-lifetimes` implied by `-D warnings`
= help: for further information visit
https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
```

Signed-off-by: wllenyj <wllenyj@linux.alibaba.com>

src/passthrough/mod.rs

@@ -136,7 +136,7 @@ fn is_safe_inode(mode: u32) -> bool {
     matches!(mode & libc::S_IFMT, libc::S_IFREG | libc::S_IFDIR)
 }
 
-impl<'a> InodeData {
+impl InodeData {
     fn new(inode: Inode, f: FileOrHandle, refcount: u64, altkey: InodeAltKey, mode: u32) -> Self {
         InodeData {
             inode,