conf: Remove defaultFormat from VIR_STORAGE_POOL_ZFS

The ZFS pool is documented as not using pool format types, so remove
the defaultFormat value.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
ACKed-by: NMichal Privoznik <mprivozn@redhat.com>

src/conf/storage_conf.c

@@ -268,7 +268,6 @@ static virStoragePoolTypeInfo poolTypeInfo[] = {
      .poolOptions = {
          .flags = (VIR_STORAGE_POOL_SOURCE_NAME |
                    VIR_STORAGE_POOL_SOURCE_DEVICE),
-         .defaultFormat = VIR_STORAGE_FILE_RAW,
      },
     },
     {.poolType = VIR_STORAGE_POOL_VSTORAGE,