MFC r248567:
Do not call vnode_pager_setsize() while a NFS node mutex is
locked. vnode_pager_setsize() might sleep waiting for the page after
EOF be unbusied.

Call vnode_pager_setsize() both for the regular and directory vnodes.

MFC r248581:
Initialize the variable to avoid (false) compiler warning about
use of an uninitialized local.