Fix signedness warning.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@16013 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/hx509/name.c

@@ -71,7 +71,7 @@ static char *
 quote_string(const char *f, size_t len, size_t *rlen)
 {
     size_t i, j, tolen;
-    const unsigned char *from = f;
+    const unsigned char *from = (const unsigned char *)f;
     unsigned char *to;
 
     tolen = len * 3 + 1;