fix: Remove an immediate ref to a deref

Caught by clippy now. https://rust-lang.github.io/rust-clippy/master/index.html#borrow_deref_ref

influxdb_line_protocol/src/lib.rs

@@ -418,7 +418,7 @@ impl<'a> EscapedStr<'a> {
     /// single slice. The slice may not point into the original
     /// buffer.
     pub fn as_str(&self) -> &str {
-        &*self
+        self
     }
 }
 

iox_query/src/exec/field.rs

@@ -123,7 +123,7 @@ impl FieldIndexes {
             .iter()
             .map(|column_name| {
                 schema
-                    .index_of(&*column_name)
+                    .index_of(column_name)
                     .context(ColumnNotFoundForFieldSnafu {
                         column_name: column_name.as_ref(),
                     })
@@ -157,7 +157,7 @@ impl FieldIndexes {
                     .map(|(field_name, timestamp_name)| {
                         let field_index =
                             schema
-                                .index_of(&*field_name)
+                                .index_of(field_name)
                                 .context(ColumnNotFoundForFieldSnafu {
                                     column_name: field_name.as_ref(),
                                 })?;

write_buffer/src/kafka/mod.rs

@@ -74,7 +74,7 @@ impl RSKafkaProducer {
                     Box::new(partition_client),
                     topic_name.clone(),
                     KafkaPartition::new(sequencer_id.try_into().unwrap()),
-                    &*metric_registry,
+                    metric_registry,
                 );
 
                 let mut producer_builder =