6385 Fix unlocking order in zfs_zget
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Andriy Gapon <avg@freebsd.org>
Approved by: Robert Mustacchi <rm@joyent.com>

*** 1146,1157 ****
                  } else {
                          VN_HOLD(ZTOV(zp));
                          *zpp = zp;
                          err = 0;
                  }
-                 sa_buf_rele(db, NULL);
                  mutex_exit(&zp->z_lock);
                  ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
                  return (err);
          }
  
          /*
--- 1146,1157 ----
                  } else {
                          VN_HOLD(ZTOV(zp));
                          *zpp = zp;
                          err = 0;
                  }
                  mutex_exit(&zp->z_lock);
+                 sa_buf_rele(db, NULL);
                  ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
                  return (err);
          }
  
          /*