refactor: remove unused method

Author: maschad

zkevm-circuits/src/evm_circuit/util.rs

@@ -475,14 +475,6 @@ impl<'a> StepRws<'a> {
         self.offset += 1;
         rw
     }
-    /// Return the next rw operations over the next `n` steps.
-    pub(crate) fn next_n(&mut self, n: usize) -> Vec<Rw> {
-        let mut rws = Vec::with_capacity(n);
-        for _ in 0..n {
-            rws.push(self.next());
-        }
-        rws
-    }
 }
 
 #[cfg(test)]