[incfs] Fix bad path::join()

Didn't really clean up extra slashes when joining

Bug: 151241369
Test: atest libincfs-test
Change-Id: If874bb4b3ca714f9f46cca6d0e7bd12bd452aa73
1 file changed
tree: 61b6f2b0bae1b4c38897c531db769cc776c73765
  1. incfs/
  2. libdataloader/
  3. .clang-format
  4. PREUPLOAD.cfg