3955 ztest failure: assertion refcount_count(&tx->tx_space_written) + delta <= tx->tx_space_towrite
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>

*** 3603,3612 ****
--- 3603,3615 ----
          if (freeit)
                  dmu_tx_hold_free(tx, bigobj, bigoff, bigsize);
          else
                  dmu_tx_hold_write(tx, bigobj, bigoff, bigsize);
  
+         /* This accounts for setting the checksum/compression. */
+         dmu_tx_hold_bonus(tx, bigobj);
+ 
          txg = ztest_tx_assign(tx, TXG_MIGHTWAIT, FTAG);
          if (txg == 0) {
                  umem_free(packbuf, packsize);
                  umem_free(bigbuf, bigsize);
                  return;