chore(ext/ffi): Remove unnecessary byte_offset conditional slicing (d…

…enoland#15320)

ext/ffi/lib.rs

@@ -1030,11 +1030,7 @@ fn ffi_parse_pointer_arg(
  type_error("Invalid FFI ArrayBufferView, expected data in the buffer")
  })?
  .get_backing_store();
- if byte_offset > 0 {
- &backing_store[byte_offset..] as *const _ as *const u8
- } else {
- &backing_store[..] as *const _ as *const u8
- }
+ &backing_store[byte_offset..] as *const _ as *const u8
  } else if let Ok(value) = v8::Local::<v8::BigInt>::try_from(arg) {
  value.u64_value().0 as usize as *const u8
  } else if let Ok(value) = v8::Local::<v8::Number>::try_from(arg) {
@@ -1592,11 +1588,7 @@ unsafe fn do_ffi_callback(
  .buffer(scope)
  .expect("Unable to deserialize result parameter.")
  .get_backing_store();
- if byte_offset > 0 {
- &backing_store[byte_offset..] as *const _ as *const u8
- } else {
- &backing_store[..] as *const _ as *const u8
- }
+ &backing_store[byte_offset..] as *const _ as *const u8
  } else if let Ok(value) = v8::Local::<v8::BigInt>::try_from(value) {
  value.u64_value().0 as usize as *const u8
  } else if let Ok(value) = v8::Local::<v8::ArrayBuffer>::try_from(value) {
@@ -2039,11 +2031,7 @@ where
  })?
  .get_backing_store();
  let byte_offset = value.byte_offset();
- if byte_offset > 0 {
- &backing_store[byte_offset..] as *const _ as *const u8
- } else {
- &backing_store[..] as *const _ as *const u8
- }
+ &backing_store[byte_offset..] as *const _ as *const u8
  } else if let Ok(value) = v8::Local::<v8::ArrayBuffer>::try_from(buf.v8_value)
  {
  let backing_store = value.get_backing_store();