Fix NPE during dumpsys

When running dumpsys SurfaceFlinger during boot, it's possible that
mFlagManager is still null.

Bug: 203165976
Test: adb shell dumpsys SurfaceFlinger
Change-Id: Idff6d5e1267591813e960490539e1a5aaaea0163

parent be204679

services/surfaceflinger/SurfaceFlinger.cpp

+3 −1

Original line number	Diff line number	Diff line
		@@ -5436,7 +5436,9 @@ void SurfaceFlinger::dumpAllLocked(const DumpArgs& args, std::string& result) co
		/*
		* Dump flag/property manager state
		*/
		if (mFlagManager != nullptr) {
		mFlagManager->dump(result);
		}

		result.append(mTimeStats->miniDump());
		result.append("\n");