pw_rpc: Fix size report

An API change broke the pw_rpc size reports.

Change-Id: I402cf734bbf02b8bd590bb9d67f5d76215a19d62
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/110471
Reviewed-by: Wyatt Hepler <hepler@google.com>
Reviewed-by: Ted Pudlik <tpudlik@google.com>
Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com>
Reviewed-by: Rob Mohr <mohrr@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pw_rpc/size_report/server_with_echo_service.cc b/pw_rpc/size_report/server_with_echo_service.cc
index f977126..0505261 100644
--- a/pw_rpc/size_report/server_with_echo_service.cc
+++ b/pw_rpc/size_report/server_with_echo_service.cc
@@ -79,7 +79,7 @@
   pw::sys_io::WriteBytes(packet_buffer);
 
   my_product::server.RegisterService(my_product::echo_service);
-  my_product::server.ProcessPacket(packet_buffer, my_product::output);
+  my_product::server.ProcessPacket(packet_buffer);
 
   return static_cast<int>(packet_buffer[92]);
 }