fix clippy warnings

src/types/from_sql.rs

@@ -38,9 +38,9 @@ impl Error for FromSqlError {
     #[cfg_attr(feature="clippy", allow(match_same_arms))]
     fn cause(&self) -> Option<&Error> {
         match *self {
-            FromSqlError::InvalidType => None,
-            FromSqlError::OutOfRange(_) => None,
             FromSqlError::Other(ref err) => err.cause(),
+            FromSqlError::InvalidType |
+            FromSqlError::OutOfRange(_) => None,
         }
     }
 }

src/types/value_ref.rs

@@ -54,7 +54,7 @@ impl<'a> ValueRef<'a> {
     /// `Err(Error::InvalidColumnType)`.
     pub fn as_str(&self) -> FromSqlResult<&str> {
         match *self {
-            ValueRef::Text(ref t) => Ok(t),
+            ValueRef::Text(t) => Ok(t),
             _ => Err(FromSqlError::InvalidType),
         }
     }
@@ -63,7 +63,7 @@ impl<'a> ValueRef<'a> {
     /// `Err(Error::InvalidColumnType)`.
     pub fn as_blob(&self) -> FromSqlResult<&[u8]> {
         match *self {
-            ValueRef::Blob(ref b) => Ok(b),
+            ValueRef::Blob(b) => Ok(b),
             _ => Err(FromSqlError::InvalidType),
         }
     }