Avoid sign extension of the mmap offset.

off_t is signed to support seeking backwards, but that's a liability
when using off_t to represent a subset of a file.

Change-Id: I2a3615166eb16212347eb47f1242e3bfb93c2022
Merge "Avoid sign extension of the mmap offset."
Bump the number of TLS slots to 128.

Bug: 9997352
Change-Id: I7bde7228d803e9d4bb83309c5891d54a07e3b025
Merge "Bump the number of TLS slots to 128."
Merge remote-tracking branch 'aosp/master'
Fix build error for mmap.c