Build kernel VOP_UNLOCK error

[=?gb2312?B?zuIgz/7R9A==?=]

/usr/src/sys/modules/union/../../miscfs/union/union_vnops.c: In function 
`union_lookup':
/usr/src/sys/modules/union/../../miscfs/union/union_vnops.c:598: `td' 
undeclared (first use in this function)
/usr/src/sys/modules/union/../../miscfs/union/union_vnops.c:598: (Each 
undeclared identifier is reported only once
/usr/src/sys/modules/union/../../miscfs/union/union_vnops.c:598: for 
each function it appears in.)
vnode_if.h:876: warning: inlining failed in call to `VOP_UNLOCK'
/usr/src/sys/modules/union/../../miscfs/union/union_vnops.c:598: 
warning: called from here
/usr/src/sys/modules/union/../../miscfs/union/union_vnops.c: In function 
`union_inactive':
/usr/src/sys/modules/union/../../miscfs/union/union_vnops.c:1705: 
warning: unused variable `vpp'
/usr/src/sys/modules/union/../../miscfs/union/union_vnops.c: In function 
`union_unlock':
/usr/src/sys/modules/union/../../miscfs/union/union_vnops.c:1803: 
warning: unused variable `un'
*** Error code 1

Stop in /usr/src/sys/modules/union.
*** Error code 1

Stop in /usr/src/sys/modules.
*** Error code 1

Stop in /usr/src/sys/compile/digo

the problem is cvsup after
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