Fix mis-spelling of bits and types names in the vnode_pager_putpages().
The changes should not modify the generated code.

The pager->pgo_putpages() method takes int flags as its fourth
argument, while vnode_pager_putpages() used boolean_t (which is
typedef'ed to int).  The flags are from VM_PAGER_* namespace, while
vnode_pager_putpages() passed TRUE and OBJPC_SYNC to VOP_PUTPAGES(),
which both are numerically equal to VM_PAGER_PUT_SYNC.

Noted and reviewed by:	alc (previous version)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week