Remove useless retry-loop

This was needed in the past although we would never enter the loop. But call
unwrap directly would fail.

examples/store_latency.rs

@@ -113,11 +113,7 @@ fn compute_latency(
     let ((), time) = measure(timer, || {
         for i in 0..count {
             let key = 1 + key_increment * i;
-            // For some reason the kernel sometimes fails.
-            while store.insert(key, &vec![0; 4 * word_length]).is_err() {
-                // We never enter this loop in practice, but we still need it for the kernel.
-                writeln!(console, "Retry insert.").unwrap();
-            }
+            store.insert(key, &vec![0; 4 * word_length]).unwrap();
         }
     });
     writeln!(console, "Setup: {:.1}ms for {} entries.", time.ms(), count).unwrap();