abi: unify st_nlink

It has different types on different architectures. Let's just simplify
things and depress clippy on it. This would fix clippy error on archs
like s390x as well.

Signed-off-by: Peng Tao <[email protected]>

Author: bergwolf

src/abi/fuse_abi_linux.rs

@@ -595,10 +595,8 @@ impl Attr {
             // In Linux st.st_nlink is u64 on x86_64 and powerpc64, and u32 on other architectures
             // ref:
             // linux: https://github.com/rust-lang/rust/blob/1.69.0/library/std/src/os/linux/raw.rs#L333
-            #[cfg(any(target_arch = "x86_64", target_arch = "powerpc64"))]
+            #[allow(clippy::unnecessary_cast)]
             nlink: st.st_nlink as u32,
-            #[cfg(not(any(target_arch = "x86_64", target_arch = "powerpc64")))]
-            nlink: st.st_nlink,
             uid: st.st_uid,
             gid: st.st_gid,
             rdev: st.st_rdev as u32,