mild borrow_mut cleanup

src/mutators/scheduled.rs

@@ -42,7 +42,7 @@ where
         }
         let idx;
         {
-            idx = self.rand().borrow_mut().below(count) as usize;
+            idx = self.rand_below(count) as usize;
         }
         self.mutation_by_idx(idx)
     }
@@ -180,7 +180,7 @@ where
     M: Mutator<I>,
     I: Input + HasBytesVec,
 {
-    let bit = mutator.rand().borrow_mut().below(input.bytes().len() as u64) as usize;
+    let bit = mutator.rand_below(input.bytes().len() as u64) as usize;
     input.bytes_mut()[bit >> 3] ^= (128 >> (bit & 7)) as u8;
     Ok(())
 }

src/stages/mutational.rs

@@ -24,7 +24,7 @@ where
     }
 
     fn iterations(&mut self) -> usize {
-        1 + self.rand().borrow_mut().below(128) as usize
+        1 + self.rand_below(128) as usize
     }
 
     fn perform_mutational(&mut self, entry: Rc<RefCell<Testcase<I>>>) -> Result<(), AflError> {