disk: composite: fix into_iter warnings

Convert into_iter() calls into iter() where appropriate:
rust-lang/rust#66145

BUG=b:181674168
TEST=cargo test -p disk --features=composite-disk

Change-Id: I9c82a7b956598628010a3dbb33db6e425bbc4e2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2743402
Tested-by: kokoro <[email protected]>
Commit-Queue: Daniel Verkamp <[email protected]>
Reviewed-by: Dennis Kempin <[email protected]>
Reviewed-by: Dylan Reid <[email protected]>

Author: danielverkamp

disk/src/composite.rs

@@ -468,7 +468,7 @@ mod tests {
         composite
             .read_exact_at_volatile(output_volatile_memory.get_slice(0, 200).unwrap(), 50)
             .unwrap();
-        assert!(input_memory.into_iter().eq(output_memory.into_iter()));
+        assert!(input_memory.iter().eq(output_memory.iter()));
     }
 
     #[test]
@@ -508,7 +508,7 @@ mod tests {
         for i in 50..250 {
             input_memory[i] = 0;
         }
-        assert!(input_memory.into_iter().eq(output_memory.into_iter()));
+        assert!(input_memory.iter().eq(output_memory.iter()));
     }
 
     #[test]
@@ -559,6 +559,6 @@ mod tests {
                 i, input_memory[i], output_memory[i]
             );
         }
-        assert!(input_memory.into_iter().eq(output_memory.into_iter()));
+        assert!(input_memory.iter().eq(output_memory.iter()));
     }
 }