Fix double free of title

svn path=/trunk/netsurf/; revision=10386

riscos/artworks.c

@@ -215,7 +215,6 @@ bool artworks_convert(struct content *c)
 
 void artworks_destroy(struct content *c)
 {
-	free(c->title);
 	free(c->data.artworks.block);
 }
 

riscos/draw.c

@@ -97,7 +97,6 @@ bool draw_convert(struct content *c)
 
 void draw_destroy(struct content *c)
 {
-	free(c->title);
 }
 
 

riscos/sprite.c

@@ -104,7 +104,6 @@ void sprite_destroy(struct content *c)
 {
 	/* do not free c->data.sprite.data at it is simply a pointer to
 	 * 4 bytes beforec->source_data. */
-	free(c->title);
 }