Addressed missed comments from ag/24539449

The CL with Change-ID Ib6b124db4108d11260b220cc57444007b9d865a6
was submitted before all reviewers had a chance to take a look.

Addressing missed comments here.

Bug: 293587049
Bug: 278783893
Test: presubmit
Change-Id: I2946c0216935a35af05a3f74f1e2a5bd8e23fed1
diff --git a/libs/input/PointerController.cpp b/libs/input/PointerController.cpp
index c41cd04..abd9284 100644
--- a/libs/input/PointerController.cpp
+++ b/libs/input/PointerController.cpp
@@ -354,13 +354,12 @@
     return it != di.end() ? it->transform : kIdentityTransform;
 }
 
-void PointerController::dump(std::string& dump) {
+std::string PointerController::dump() {
     if (!mEnabled) {
-        dump += INDENT "PointerController: DISABLED due to ongoing PointerChoreographer refactor\n";
-        return;
+        return INDENT "PointerController: DISABLED due to ongoing PointerChoreographer refactor\n";
     }
 
-    dump += INDENT "PointerController:\n";
+    std::string dump = INDENT "PointerController:\n";
     std::scoped_lock lock(getLock());
     dump += StringPrintf(INDENT2 "Presentation: %s\n",
                          ftl::enum_string(mLocked.presentation).c_str());
@@ -373,6 +372,7 @@
     for (const auto& [_, spotController] : mLocked.spotControllers) {
         spotController.dump(dump, INDENT3);
     }
+    return dump;
 }
 
 } // namespace android
diff --git a/libs/input/PointerController.h b/libs/input/PointerController.h
index de39eda..aa7ca3c 100644
--- a/libs/input/PointerController.h
+++ b/libs/input/PointerController.h
@@ -75,7 +75,7 @@
     void onDisplayInfosChangedLocked(const std::vector<gui::DisplayInfo>& displayInfos)
             REQUIRES(getLock());
 
-    void dump(std::string& dump);
+    std::string dump();
 
 protected:
     using WindowListenerConsumer =