Cleanup unneeded iter/into_iter for for-loops.

Author: kamadak

examples/reading.rs

@@ -44,7 +44,7 @@ fn main() {
                     Tag::XResolution,
                     Tag::ImageDescription,
                     Tag::DateTime];
-    for &tag in tag_list.iter() {
+    for tag in tag_list {
         if let Some(field) = exif.get_field(tag, In::PRIMARY) {
             println!("{}: {}",
                      field.tag, field.display_value().with_unit(&exif));

src/writer.rs

@@ -857,7 +857,7 @@ mod tests {
              (12, 2, b"\x00\x00\x00\x00\x00\x00\x04\x40\
                        \x00\x00\x00\x00\x00\x00\xe0\xbf".to_vec())),
         ];
-        for (val, be, le) in patterns.into_iter() {
+        for (val, be, le) in patterns {
             assert_eq!(compose_value::<BigEndian>(&val).unwrap(), be);
             assert_eq!(compose_value::<LittleEndian>(&val).unwrap(), le);
         }