Fix warnings in preparation for Rust 1.54.0

This CL fixes several new warnings generated by rustc 1.54.0.

Bug: 194812675
Test: m rust
Change-Id: I3076313ea51c6f4e74029ad9fb45d6f0b6dea460
diff --git a/keystore2/src/database/utils.rs b/keystore2/src/database/utils.rs
index 90f5616..b4590da 100644
--- a/keystore2/src/database/utils.rs
+++ b/keystore2/src/database/utils.rs
@@ -44,7 +44,7 @@
     loop {
         match rows.next().context("In with_rows_extract_all: Failed to unpack row")? {
             Some(row) => {
-                row_extractor(&row).context("In with_rows_extract_all.")?;
+                row_extractor(row).context("In with_rows_extract_all.")?;
             }
             None => break Ok(()),
         }