Fix server side large message receiving

The check for whether to request more data was all messed up.
On the client this needs to be after initial metadata is sent to guarantee that we have a live stream, but there's no such requirement at the server. Fix this.

I also ran clang-format across the code so there are some formatting changes.

src/core/surface/call.c

@@ -360,8 +360,7 @@ static void unlock(grpc_call *call) {
   int num_completed_requests = call->num_completed_requests;
   int need_more_data =
       call->need_more_data &&
-      !call->sending &&
+      (call->write_state >= WRITE_STATE_STARTED || !call->is_client);
-      call->write_state >= WRITE_STATE_STARTED;
   int i;
 
   if (need_more_data) {
@@ -536,14 +535,16 @@ static void finish_finish_step(void *pc, grpc_op_error error) {
 }
 
 static void finish_start_step(void *pc, grpc_op_error error) {
-  finish_send_op(pc, GRPC_IOREQ_SEND_INITIAL_METADATA, WRITE_STATE_STARTED, error);
+  finish_send_op(pc, GRPC_IOREQ_SEND_INITIAL_METADATA, WRITE_STATE_STARTED,
+                 error);
 }
 
 static send_action choose_send_action(grpc_call *call) {
   switch (call->write_state) {
     case WRITE_STATE_INITIAL:
       if (is_op_live(call, GRPC_IOREQ_SEND_INITIAL_METADATA)) {
-        if (is_op_live(call, GRPC_IOREQ_SEND_MESSAGE) || is_op_live(call, GRPC_IOREQ_SEND_CLOSE)) {
+        if (is_op_live(call, GRPC_IOREQ_SEND_MESSAGE) ||
+            is_op_live(call, GRPC_IOREQ_SEND_CLOSE)) {
           return SEND_BUFFERED_INITIAL_METADATA;
         } else {
           return SEND_INITIAL_METADATA;