fix clippy

Author: zjk261

core/src/avm_rng.rs

@@ -13,21 +13,12 @@ const C2: i32 = 789221;
 const C3: i32 = 15731;
 const K_RANDOM_PURE_MAX: i32 = 0x7FFFFFFF;
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, Default)]
 pub struct AvmRng {
     u_value: u32,
     u_xor_mask: u32,
 }
 
-impl Default for AvmRng {
-    fn default() -> Self {
-        Self {
-            u_value: 0, // 0 means uninitialized
-            u_xor_mask: 0,
-        }
-    }
-}
-
 impl AvmRng {
     pub fn init_with_seed(&mut self, seed: u32) {
         self.u_value = seed;
@@ -43,15 +34,15 @@ impl AvmRng {
         self.u_value as i32
     }
 
-    fn random_pure_hasher(&self, mut i_seed: i32) -> i32 {
+    fn random_pure_hasher(self, mut i_seed: i32) -> i32 {
         i_seed = ((i_seed << 13) ^ i_seed).wrapping_sub(i_seed >> 21);
 
         let mut i_result = i_seed.wrapping_mul(i_seed);
         i_result = i_result.wrapping_mul(C3);
         i_result = i_result.wrapping_add(C2);
         i_result = i_result.wrapping_mul(i_seed);
         i_result = i_result.wrapping_add(C1);
-        i_result = i_result & K_RANDOM_PURE_MAX;
+        i_result &= K_RANDOM_PURE_MAX;
 
         i_result = i_result.wrapping_add(i_seed);