fusefs: fix some resource leaks
fusefs would leak tickets in three cases:
- After FUSE_CREATE, if the server returned a bad inode number.
- After a FUSE_FALLOCATE operation during VOP_ALLOCATE
- After a FUSE_FALLOCATE operation during VOP_DEALLOCATE
MFC after: 3 days
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D38526