Add entity encoding for input options when outputting an xml file.

Entity encoding was missing (for options) in generation of an xspf playlist.
On the reading side the entity decoding is all fine.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
(cherry picked from commit 21f056e8)

modules/misc/playlist/xspf.c

@@ -208,10 +208,18 @@ xspfexportitem_end:
 
     for( int i = 0; i < p_item->p_input->i_options; i++ )
     {
-        fprintf( p_file, "\t\t\t\t<vlc:option>%s</vlc:option>\n",
-                 p_item->p_input->ppsz_options[i][0] == ':' ?
-                 p_item->p_input->ppsz_options[i] + 1 :
-                 p_item->p_input->ppsz_options[i] );
+        char* psz_src = p_item->p_input->ppsz_options[i];
+        char* psz_ret = NULL;
+
+        if ( psz_src[0] == ':' )
+            psz_src++;
+
+        psz_ret = convert_xml_special_chars( psz_src );
+        if ( psz_ret == NULL )
+            continue;
+
+        fprintf( p_file, "\t\t\t\t<vlc:option>%s</vlc:option>\n", psz_ret );
+        free( psz_ret );
     }
     fputs( "\t\t\t</extension>\n", p_file );
     fputs( "\t\t</track>\n", p_file );