statsd: fix double close.

Previously, fdopen was being called on a file descriptor that was owned
by a unique_fd without releasing. This leads to a double close, since
both fclose and the unique_fd destructor will try to close the fd.

Bug: http://b/113880863
Test: treehugger
Change-Id: I6f6f48d304861b5e4d7efee0d3ad0e30178a95a4

cmds/statsd/src/external/Perfetto.cpp

@@ -105,9 +105,9 @@ bool CollectPerfettoTraceAndUploadToDropbox(const PerfettoDetails& config,
 
     readPipe.reset();  // Close the read end (owned by the child process).
 
-    // Using fopen() because fwrite() has the right logic to chunking write()
+    // Using fdopen() because fwrite() has the right logic to chunking write()
     // over a pipe (see __sfvwrite()).
-    FILE* writePipeStream = fdopen(writePipe.get(), "wb");
+    FILE* writePipeStream = android::base::Fdopen(std::move(writePipe), "wb");
     if (!writePipeStream) {
         ALOGE("fdopen() failed while calling the Perfetto client: %s", strerror(errno));
         return false;