Allow two instances where read result is not-checked

There is ongoing work, see:
stratis-storage#476, and the ultimate
plan is to come up w/ better formalization of how errors in reading
metadata are handled.

Signed-off-by: mulhern <[email protected]>

src/engine/strat_engine/metadata.rs

@@ -190,8 +190,11 @@ impl StaticHeader {
     fn setup<F>(f: &mut F) -> EngineResult<Option<StaticHeader>>
         where F: Read + Seek
     {
+        #![allow(unused_io_amount)]
         f.seek(SeekFrom::Start(0))?;
         let mut buf = [0u8; _BDA_STATIC_HDR_SIZE];
+
+        // FIXME: See https://github.com/stratis-storage/stratisd/pull/476
         f.read(&mut buf)?;
 
         // TODO: repair static header if one incorrect?
@@ -224,10 +227,12 @@ impl StaticHeader {
     pub fn determine_ownership<F>(f: &mut F) -> EngineResult<DevOwnership>
         where F: Read + Seek
     {
-
+        #![allow(unused_io_amount)]
 
         f.seek(SeekFrom::Start(0))?;
         let mut buf = [0u8; _BDA_STATIC_HDR_SIZE];
+
+        // FIXME: See https://github.com/stratis-storage/stratisd/pull/476
         f.read(&mut buf)?;
 
         // Using setup() as a test of ownership sets a high bar. It is