Structure declaration without its members variables

[Valdis.Kletnieks at vt.edu]

On Mon, 27 Apr 2015 00:16:59 +0530, harshkdev said:

> struct kvm;
> struct kvm_vcpu;
>
> Generally we declare structure and its member at same place.

It's a forward declaration.

Consider two structures that have pointers to each other:

struct a {
      int b, c, d;
      struct *b b_ptr;
}

struct b {
	int foo, bar, baz;
	struct *a a_ptr;
}

Now, the struct *b in the first structure won't compile because it hasn't
seen b yet.  So we stick a 'struct b;' in front both of them so struct a can
compile successfully.
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