Removed unused typedef to avoid "unused local typedef" warnings.

Fix warnings about unused local typedefs (reported by gcc 4.8).

Signed-off-by: Han Shen <(shenhan@google.com)>

Change-Id: I4bccc234f1390daa808d2b309ed112e20c0ac096
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>