Create suggested-fixes.zip before exiting on error

suggested-fixes.zip is useful even when lint is exiting with an
error.  Save the exit code from the lint executable, create the
zip file, then re-exit with the exit code.

Bug: 216456886
Test: Introduce lint error, verify suggested-fixes.zip is created.
Change-Id: I0ba6190e3de0744e53b2a59ba3016861f2f115e2