Fix performance-for-range-copy warnings

Bug: 30413223
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,performance*
Change-Id: Ia63c695575d2602ff7e67db874d423b99f4daeef
diff --git a/services/oboeservice/AAudioServiceEndpointPlay.cpp b/services/oboeservice/AAudioServiceEndpointPlay.cpp
index a274466..ebba32d 100644
--- a/services/oboeservice/AAudioServiceEndpointPlay.cpp
+++ b/services/oboeservice/AAudioServiceEndpointPlay.cpp
@@ -84,7 +84,7 @@
             int64_t mmapFramesWritten = getStreamInternal()->getFramesWritten();
 
             std::lock_guard <std::mutex> lock(mLockStreams);
-            for (const auto clientStream : mRegisteredStreams) {
+            for (const auto& clientStream : mRegisteredStreams) {
                 int64_t clientFramesRead = 0;
                 bool allowUnderflow = true;