turn: client binding direct use Option value (#686)

Signed-off-by: Xiaobo Liu <cppcoffee@gmail.com>

Author: cppcoffee

turn/src/client/binding.rs

@@ -97,19 +97,13 @@ impl BindingManager {
     }
 
     pub(crate) fn find_by_number(&self, number: u16) -> Option<&Binding> {
-        if let Some(s) = self.chan_map.get(&number) {
-            self.addr_map.get(s)
-        } else {
-            None
-        }
+        let s = self.chan_map.get(&number)?;
+        self.addr_map.get(s)
     }
 
     pub(crate) fn get_by_number(&mut self, number: u16) -> Option<&mut Binding> {
-        if let Some(s) = self.chan_map.get(&number) {
-            self.addr_map.get_mut(s)
-        } else {
-            None
-        }
+        let s = self.chan_map.get(&number)?;
+        self.addr_map.get_mut(s)
     }
 
     pub(crate) fn delete_by_addr(&mut self, addr: &SocketAddr) -> bool {