Remove the lz4_ac local variable from dmu_write_policy() to resolve
the following unused variable warning on non-debug builds.
dmu.c: In function ‘dmu_write_policy’:
dmu.c:1892:12: warning: unused variable ‘lz4_ac’ [-Wunused-variable]
boolean_t lz4_ac = spa_feature_is_active(os->os_spa,
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
1eab430af7