* fns.c (Fstring_as_unibyte): Use xlispstrdup.

src/ChangeLog

+2013-10-16  Dmitry Antipov  <dmantipov@yandex.ru>
+
+	* fns.c (Fstring_as_unibyte): Use xlispstrdup.
+
 2013-10-15  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* print.c (print_object): Print " ..." when truncating bool vectors.

src/fns.c

@@ -1009,11 +1009,9 @@ If STRING is multibyte and contains a character of charset
 
   if (STRING_MULTIBYTE (string))
     {
-      ptrdiff_t bytes = SBYTES (string);
-      unsigned char *str = xmalloc (bytes);
+      unsigned char *str = xlispstrdup (string);
+      ptrdiff_t bytes = str_as_unibyte (str, SBYTES (string));
 
-      memcpy (str, SDATA (string), bytes);
-      bytes = str_as_unibyte (str, bytes);
       string = make_unibyte_string ((char *) str, bytes);
       xfree (str);
     }