Add mode bits to a call to open with O_CREAT

Open with O_CREAT needs mode bits: https://linux.die.net/man/3/open

Found by running clang FORTIFY over AOSP.

Bug: 32073964
Test: Now builds with clang FORTIFY.
Change-Id: Iee4c93c5482f510e0adf8104c27e394b5d87ec88
1 file changed