(Fw16_set_clipboard_data): Don't encode text if clipboard is unavailable.

Set dst to NULL if it doesn't point to malloc'ed data.
(Fw16_get_clipboard_data): Initialize htext to NULL, to avoid passing random
values to xfree.

src/ChangeLog

 2008-08-30  Eli Zaretskii  <eliz@gnu.org>
+	* w16select.c (Fw16_set_clipboard_data): Don't encode text if
+	clipboard is unavailable.  Set dst to NULL if it doesn't point to
+	malloc'ed data.
+	(Fw16_get_clipboard_data): Initialize htext to NULL, to avoid
+	passing random values to xfree.
+
 	* dispnew.c (init_display): Set `tty's association in frame's
 	parameters alist to the name of the terminal device, if that is
 	known.

src/w16select.c

@@ -500,6 +500,9 @@ DEFUN ("w16-set-clipboard-data", Fw16_set_clipboard_data, Sw16_set_clipboard_dat
 
   BLOCK_INPUT;
 
+  if (!open_clipboard ())
+    goto error;
+
   nbytes = SBYTES (string);
   src = SDATA (string);
 
@@ -515,6 +518,7 @@ DEFUN ("w16-set-clipboard-data", Fw16_set_clipboard_data, Sw16_set_clipboard_dat
 	 will have to convert it to DOS CR-LF style.  */
       no_crlf_conversion = 0;
       Vlast_coding_system_used = Qraw_text;
+      dst = NULL;	/* so we don't try to free a random pointer */
     }
   else
     {
@@ -541,9 +545,6 @@ DEFUN ("w16-set-clipboard-data", Fw16_set_clipboard_data, Sw16_set_clipboard_dat
       src = dst;
     }
 
-  if (!open_clipboard ())
-    goto error;
-
   ok = empty_clipboard ()
     && ((put_status
 	 = set_clipboard_data (CF_OEMTEXT, src, nbytes, no_crlf_conversion))
@@ -595,7 +596,7 @@ DEFUN ("w16-get-clipboard-data", Fw16_get_clipboard_data, Sw16_get_clipboard_dat
      Lisp_Object frame;
 {
   unsigned data_size, truelen;
-  unsigned char *htext;
+  unsigned char *htext = NULL;
   Lisp_Object ret = Qnil;
   int no_crlf_conversion, require_decoding = 0;