Cleanup: Simplify phase_get_errno
Cleanup: Simplify phase_get_errno

Change-Id: I2eebc6e2e14516ed9950295814e9e97bb66868d7
Reviewed-on: http://review.couchbase.org/91084
Reviewed-by: Daniel Owen <b3fc0e1a51f252986e60be7da121b74d3ac6845f@couchbase.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine