servicemanager: log if doesn't become ctx mgr

Currently, this is a silent failure.

This is made to be fatal in a separate patch, for
revertability.

Bug: 280514080
Test: boot
Change-Id: If5a524f056d77905c818f466c5c677666caa1640
diff --git a/cmds/servicemanager/main.cpp b/cmds/servicemanager/main.cpp
index c1a04dd..520d6f9 100644
--- a/cmds/servicemanager/main.cpp
+++ b/cmds/servicemanager/main.cpp
@@ -131,7 +131,10 @@
     }
 
     IPCThreadState::self()->setTheContextObject(manager);
-    ps->becomeContextManager();
+    if (!ps->becomeContextManager()) {
+        LOG(ERROR) << "Could not become context manager";
+        // TODO(b/280514080): fatal
+    }
 
     sp<Looper> looper = Looper::prepare(false /*allowNonCallbacks*/);
 
diff --git a/libs/binder/include/binder/ProcessState.h b/libs/binder/include/binder/ProcessState.h
index ce578e3..81391e9 100644
--- a/libs/binder/include/binder/ProcessState.h
+++ b/libs/binder/include/binder/ProcessState.h
@@ -55,7 +55,7 @@
     // For main functions - dangerous for libraries to use
     void startThreadPool();
 
-    bool becomeContextManager();
+    [[nodiscard]] bool becomeContextManager();
 
     sp<IBinder> getStrongProxyForHandle(int32_t handle);
     void expungeHandle(int32_t handle, IBinder* binder);