Remove comparison between signed and unsigned int
Remove comparison between signed and unsigned int

Some compilers don't like the comparison between int and size_t. Remove it.

The other changes are minor style cleanups.

PiperOrigin-RevId: 276333450

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor