Simplify code into 1 statement

Signed-off-by: erikness-doordash <[email protected]>

Author: erikness-doordash

src/dispatcher.rs

@@ -428,9 +428,7 @@ impl Dispatcher {
     }
 
     fn on_grpc_receive_initial_metadata(&self, token_id: u32, headers: u32) {
-        let grpc_streams_ref = self.grpc_streams.borrow_mut();
-        let context_id_hash_slot = grpc_streams_ref.get(&token_id);
-        let context_id = match context_id_hash_slot {
+        let context_id = match self.grpc_streams.borrow_mut().get(&token_id) {
             Some(id) => *id,
             None => {
                 // TODO: change back to a panic once underlying issue is fixed.
@@ -490,9 +488,7 @@ impl Dispatcher {
     }
 
     fn on_grpc_receive_trailing_metadata(&self, token_id: u32, trailers: u32) {
-        let grpc_streams_ref = self.grpc_streams.borrow_mut();
-        let context_id_hash_slot = grpc_streams_ref.get(&token_id);
-        let context_id = match context_id_hash_slot {
+        let context_id = match self.grpc_streams.borrow_mut().get(&token_id) {
             Some(id) => *id,
             None => {
                 // TODO: change back to a panic once underlying issue is fixed.