Prevent changing name or save file when using system savedir

rogue3/save.c

@@ -51,6 +51,10 @@ save_game()
 	    msg("File name: %s", file_name);
 	    goto gotfile;
 	}
+        if (use_savedir)
+            return FALSE;
+        /* because you're not allowed to change the savefile if 
+           you're using the system savedir! */
     }
 
     do
@@ -66,11 +70,15 @@ save_game()
 	strcpy(file_name, buf);
 gotfile:
 	if ((savef = fopen(file_name, "w")) == NULL)
+        {
 	    msg(strerror(errno));	/* fake perror() */
+            if (use_savedir)
+                return FALSE;
+        }
     } while (savef == NULL);
 
     /*
-     * write out encrpyted file (after a stat)
+     * write out encrypted file (after a stat)
      * The fwrite is to force allocation of the buffer before the write
      */
     if (save_file(savef) != 0)