libbpf-rs: minor fixes suggested by linter

clippy compalined here:
https://github.com/libbpf/libbpf-rs/actions/runs/14391135733/job/40358223316

Signed-off-by: Ihor Solodrai <[email protected]>

Author: theihor

libbpf-rs/src/btf/mod.rs

@@ -630,7 +630,7 @@ impl<'btf> BtfType<'btf> {
                 let int = types::Int::try_from(skipped).unwrap();
                 Ok(Ord::min(
                     ptr_size,
-                    NonZeroUsize::new(((int.bits + 7) / 8).into()).unwrap(),
+                    NonZeroUsize::new(usize::from(int.bits.div_ceil(8))).unwrap(),
                 ))
             }
             BtfKind::Ptr => skipped.source.ptr_size(),

libbpf-rs/src/query.rs

@@ -448,14 +448,8 @@ impl Iterator for ProgInfoIter {
 
     fn next(&mut self) -> Option<Self::Item> {
         let fd = self.next_valid_fd()?;
-
         let prog = ProgramInfo::load_from_fd(fd.as_fd(), &self.opts);
-
-        match prog {
-            Ok(p) => Some(p),
-            // TODO: We should consider bubbling up errors properly.
-            Err(_err) => None,
-        }
+        prog.ok()
     }
 }
 
@@ -612,14 +606,8 @@ impl Iterator for BtfInfoIter {
 
     fn next(&mut self) -> Option<Self::Item> {
         let fd = self.next_valid_fd()?;
-
         let info = BtfInfo::load_from_fd(fd.as_fd());
-
-        match info {
-            Ok(i) => Some(i),
-            // TODO: We should consider bubbling up errors properly.
-            Err(_err) => None,
-        }
+        info.ok()
     }
 }