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>

@@ -1146,12 +1146,12 @@
                 } else {
                         VN_HOLD(ZTOV(zp));
                         *zpp = zp;
                         err = 0;
                 }
-                sa_buf_rele(db, NULL);
                 mutex_exit(&zp->z_lock);
+                sa_buf_rele(db, NULL);
                 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
                 return (err);
         }
 
         /*