Corrected small mistake in type.

Change-Id: Ib96b5dfca7fc843c83c3f15a64f141769555d9aa
Reviewed-on: https://swiftshader-review.googlesource.com/3031Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>