libfdt: Fix a typo in libfdt.h

The function mentioned in the comment, fdt_finished(), should be
changed to fdt_finish().

Signed-off-by: Yan-Jie Wang <yanjiewtw@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

libfdt/libfdt.h

@@ -1511,7 +1511,7 @@ int fdt_nop_node(void *fdt, int nodeoffset);
  * fdt_create_with_flags() begins the process of creating a new fdt with
  * the sequential write interface.
  *
- * fdt creation process must end with fdt_finished() to produce a valid fdt.
+ * fdt creation process must end with fdt_finish() to produce a valid fdt.
  *
  * returns:
  *	0, on success