refactor: remove unnecessary semicolons and elide lifetimes

- Remove unnecessary semicolons after match and if expressions
- Elide unnecessary explicit lifetime parameter in Visitor impl
- Replace hand-coded IP address with Ipv4Addr::UNSPECIFIED constant

Fixes clippy pedantic warnings

Author: josecelano

src/api/handler.rs

@@ -64,7 +64,7 @@ pub async fn get_metainfo_file_handler(
         Err(err) => {
             error!("error adding torrent to cache: {}", err);
         }
-    };
+    }
 
     torrent_file_response(
         bytes,

src/bit_torrent/info_hash.rs

@@ -334,7 +334,7 @@ impl<'de> serde::de::Deserialize<'de> for InfoHash {
 
 struct InfoHashVisitor;
 
-impl<'v> serde::de::Visitor<'v> for InfoHashVisitor {
+impl serde::de::Visitor<'_> for InfoHashVisitor {
     type Value = InfoHash;
 
     fn expecting(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
@@ -356,7 +356,7 @@ impl<'v> serde::de::Visitor<'v> for InfoHashVisitor {
                 serde::de::Unexpected::Str(v),
                 &"a hexadecimal string",
             ));
-        };
+        }
         Ok(res)
     }
 }

src/main.rs

@@ -17,7 +17,7 @@ async fn main() -> Result<(), anyhow::Error> {
 
     let session_output_dir = "/var/lib/torrust/hash2torrent/session";
     let torrents_cache_dir = "/var/lib/torrust/hash2torrent/torrents";
-    let bind_address = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), 3000);
+    let bind_address = SocketAddr::new(IpAddr::V4(Ipv4Addr::UNSPECIFIED), 3000);
 
     let config = Config {
         api: config::Api {