fix some clippy errors that are default deny

Clippy only has 6 lints that are defaulted to deny, which this CL fixes.
The first step to running clippy and establishing our own set of default
deny lints, is to ensure we aren't running afoul of the most common
deny lints.

BUG=None
TEST=cargo clippy --all

Change-Id: I225801357d76a8a9e246e3842bc9bf550fcd7207
Reviewed-on: https://chromium-review.googlesource.com/952045
Commit-Ready: Zach Reizner <zachr@chromium.org>
Tested-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/qcow/src/qcow.rs b/qcow/src/qcow.rs
index 261c737..df504de 100644
--- a/qcow/src/qcow.rs
+++ b/qcow/src/qcow.rs
@@ -455,7 +455,7 @@ impl Read for QcowFile {
 
             if let Some(offset) = file_offset {
                 self.file.seek(SeekFrom::Start(offset))?;
-                self.file.read(&mut buf[nread..(nread + count)])?;
+                self.file.read_exact(&mut buf[nread..(nread + count)])?;
             } else {
                 // Previously unwritten region, return zeros
                 for b in (&mut buf[nread..(nread + count)]).iter_mut() {