4047 panic from dbuf_free_range() from dmu_free_object() while doing zfs receive
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>

*** 1230,1240 ****
                  int err;
  
                  if (dmu_object_info(os, obj, NULL) != 0)
                          continue;
  
!                 err = dmu_free_object(os, obj);
                  if (err != 0)
                          return (err);
          }
          return (0);
  }
--- 1230,1240 ----
                  int err;
  
                  if (dmu_object_info(os, obj, NULL) != 0)
                          continue;
  
!                 err = dmu_free_long_object(os, obj);
                  if (err != 0)
                          return (err);
          }
          return (0);
  }