tree 2a1cb842fdab6fe24971993a3304ec7aa2424ff4
parent 19ef680bc46cdd26055fd3112776bba77c6e6292
author Colin Cross <ccross@android.com> 1558459348 -0700
committer Colin Cross <ccross@android.com> 1558461780 -0700

Correctly report errors in bpfmt

bpfmt was always exiting with return code 0, make it use the
exitCode recorded when reporting errors.

Also use the usage function.

Test: bpfmt -o bpfmt.go
Test: bpfmt
Test: bpfmt -h
Fixes: 113069050
Change-Id: I717d524c5f43cd36f52e33964a37324cc04c5df0