Write message to stderr on __libc_fatal()

Change-Id: Ia8d6e256768fa51786d0139d3f3b6e9e4bebe027
diff --git a/libc/bionic/libc_logging.cpp b/libc/bionic/libc_logging.cpp
index 8966a5f..8b3d3f1 100644
--- a/libc/bionic/libc_logging.cpp
+++ b/libc/bionic/libc_logging.cpp
@@ -619,7 +619,8 @@
   BufferOutputStream os(msg, sizeof(msg));
   out_vformat(os, format, args);
 
-  // TODO: log to stderr for the benefit of "adb shell" users.
+  // log to stderr for the benefit of "adb shell" users.
+  write(2, msg, strlen(msg));
 
   // Log to the log for the benefit of regular app developers (whose stdout and stderr are closed).
   __libc_write_log(ANDROID_LOG_FATAL, "libc", msg);