.Fn has no default argument; fix such a case without one.
Bump date.

man/zip_fopen.mdoc

diff --git a/man/zip_fopen.mdoc b/man/zip_fopen.mdoc
index 5ab2c20..354aa92 100644
--- a/man/zip_fopen.mdoc
+++ b/man/zip_fopen.mdoc
@@ -29,7 +29,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 .\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd June 26, 2013
+.Dd October 23, 2013
 .Dt ZIP_FOPEN 3
 .Os
 .Sh NAME
@@ -108,7 +108,7 @@
 .It Bq Er ZIP_ER_WRONGPASSWD
 The provided password does not match the password used for encryption.
 Note that some incorrect passwords are not detected by the check done by
-.Fn .
+.Fn zip_fopen .
 .It Bq Er ZIP_ER_ZLIB
 Initializing the zlib stream failed.
 .El