Fix use of memset function

memset was called with is second and third arguments reversed resulting
in a virtual no-op.
diff --git a/libzipfile/centraldir.c b/libzipfile/centraldir.c
index 4387ceb..c758e62 100644
--- a/libzipfile/centraldir.c
+++ b/libzipfile/centraldir.c
@@ -235,7 +235,7 @@
     len = (buf+bufsize)-p;

     for (i=0; i < file->totalEntryCount; i++) {

         Zipentry* entry = malloc(sizeof(Zipentry));

-        memset(entry, sizeof(Zipentry), 0);

+        memset(entry, 0, sizeof(Zipentry));

 

         err = read_central_directory_entry(file, entry, &p, &len);

         if (err != 0) {