nn: add namespace qualifier to nullptr_t reference

This was needed when implementing CTS on ChromeOS

BUG=b:161201117
Test: mma within frameworks/ml

Change-Id: Ia2f79f114653b1c44b3598e96f0cdd24cd19548f
1 file changed
tree: b914c222f43eb14e7ccc569a3263d267cbe99162
  1. nn/
  2. .clang-format
  3. CleanSpec.mk
  4. CPPLINT.cfg
  5. OWNERS
  6. PREUPLOAD.cfg