More warning removals and more db-lib result wrapping

This should be everything now

json-api/db/src/channels.rs

@@ -3,7 +3,7 @@ use mysql_async::prelude::Queryable;
 use mysql_async::Error as SqlError;
 
 use crate::{Channel, UBigInt, Integer};
-use crate::{sql_err, Response};
+use crate::Response;
 
 use rand::RngCore;
 
@@ -75,11 +75,8 @@ impl Channel {
         let mut conn = p.get_conn().await?;
 
         let q = "DELETE FROM channels WHERE id = :id";
-        let result = conn.exec_drop(q, params!{"id" => id}).await;
-        return match result {
-            Ok(_) => Ok(Response::Success),
-            Err(sql) => Ok(Response::Other(sql_err!(sql)))
-        }
+        conn.exec_drop(q, params!{"id" => id}).await?;
+        Ok(Response::Success)
     }