3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero

@@ -160,11 +160,11 @@
         if (tbl->zt_nextblk != 0) {
                 newblk = tbl->zt_nextblk;
         } else {
                 newblk = zap_allocate_blocks(zap, tbl->zt_numblks * 2);
                 tbl->zt_nextblk = newblk;
-                ASSERT3U(tbl->zt_blks_copied, ==, 0);
+                ASSERT0(tbl->zt_blks_copied);
                 dmu_prefetch(zap->zap_objset, zap->zap_object,
                     tbl->zt_blk << bs, tbl->zt_numblks << bs);
         }
 
         /*

@@ -337,11 +337,11 @@
                 dmu_buf_t *db_new;
                 int err;
 
                 ASSERT3U(zap->zap_f.zap_phys->zap_ptrtbl.zt_shift, ==,
                     ZAP_EMBEDDED_PTRTBL_SHIFT(zap));
-                ASSERT3U(zap->zap_f.zap_phys->zap_ptrtbl.zt_blk, ==, 0);
+                ASSERT0(zap->zap_f.zap_phys->zap_ptrtbl.zt_blk);
 
                 newblk = zap_allocate_blocks(zap, 1);
                 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
                     newblk << FZAP_BLOCK_SHIFT(zap), FTAG, &db_new,
                     DMU_READ_NO_PREFETCH);

@@ -473,11 +473,11 @@
         /*
          * lhr_pad was previously used for the next leaf in the leaf
          * chain.  There should be no chained leafs (as we have removed
          * support for them).
          */
-        ASSERT3U(l->l_phys->l_hdr.lh_pad1, ==, 0);
+        ASSERT0(l->l_phys->l_hdr.lh_pad1);
 
         /*
          * There should be more hash entries than there can be
          * chunks to put in the hash table
          */

@@ -656,13 +656,13 @@
 
         nl = zap_create_leaf(zap, tx);
         zap_leaf_split(l, nl, zap->zap_normflags != 0);
 
         /* set sibling pointers */
-        for (i = 0; i < (1ULL<<prefix_diff); i++) {
+        for (i = 0; i < (1ULL << prefix_diff); i++) {
                 err = zap_set_idx_to_blk(zap, sibling+i, nl->l_blkid, tx);
-                ASSERT3U(err, ==, 0); /* we checked for i/o errors above */
+                ASSERT0(err); /* we checked for i/o errors above */
         }
 
         if (hash & (1ULL << (64 - l->l_phys->l_hdr.lh_prefix_len))) {
                 /* we want the sibling */
                 zap_put_leaf(l);