chore: fix clippy lints

Author: Stebalien

fvm/src/kernel/blocks.rs

@@ -29,6 +29,9 @@ pub struct BlockStat {
 #[derive(Debug, Clone)]
 pub struct Block {
     codec: u64,
+    // Unfortunately, we usually start with a vector/boxed buffer. If we used Rc<[u8]>, we'd have to
+    // copy the bytes. So we accept some indirection for reliable performance.
+    #[allow(clippy::redundant_allocation)]
     data: Rc<Box<[u8]>>,
 }
 

sdk/src/ipld.rs

@@ -56,7 +56,7 @@ pub fn get_block(id: fvm_shared::sys::BlockId, size_hint: Option<u32>) -> Syscal
             remaining = sys::ipld::read(
                 id,
                 buf.len() as u32,
-                buf.as_mut_ptr().offset(buf.len() as isize),
+                buf.as_mut_ptr_range().end,
                 (buf.capacity() - buf.len()) as u32,
             )?;
             debug_assert!(remaining <= 0, "should have read whole block");