make failure on map creation returns -errno

This slightly improves error logging.

(also fd == 0 is not an error condition)

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I135e7405c508951fba632c634bc4e2d2161fc940
1 file changed
tree: 5d5d4ff9f0f1ebe0b341d113072dbea74bddc06c
  1. bpfloader/
  2. libbpf_android/
  3. progs/
  4. Android.bp
  5. NOTICE
  6. OWNERS
  7. PREUPLOAD.cfg