Update to latets API

mx_handle_wait_one deprecated, updating name

Change-Id: Ibca5088a542e4e6b8e5f874fe2067d598d3cc5d7
diff --git a/benchmarks/spec_fixture.cc b/benchmarks/spec_fixture.cc
index c047fb3..1abed9c 100644
--- a/benchmarks/spec_fixture.cc
+++ b/benchmarks/spec_fixture.cc
@@ -208,7 +208,7 @@
     return status;
   }
   status =
-      mx_handle_wait_one(handle, MX_PROCESS_SIGNALED, MX_TIME_INFINITE, NULL);
+      mx_object_wait_one(handle, MX_PROCESS_SIGNALED, MX_TIME_INFINITE, NULL);
 
   if (status != NO_ERROR) {
     LOG(ERROR) << "Failed to wait for process exiting " << args[0] << ":"