macosx: fixed rare crash, which could be triggered by optical stream format...

macosx: fixed rare crash, which could be triggered by optical stream format descriptions output by the auhal module

and fixed a compiler warning

modules/gui/macosx/intf.h

@@ -104,7 +104,7 @@ struct intf_sys_t
     id o_bookmarks;             /* VLCBookmarks   */
     id o_embedded_list;         /* VLCEmbeddedList*/
     id o_coredialogs;           /* VLCCoreDialogProvider */
-    VLCInformation * o_info;    /* VLCInformation */
+    id o_info;                /* VLCInfo */
     id o_eyetv;                 /* VLCEyeTVController */
     BOOL nib_main_loaded;       /* main nibfile */
     BOOL nib_open_loaded;       /* open nibfile */

modules/gui/macosx/intf.m

@@ -2589,9 +2589,8 @@ end:
 
     o_attr = [NSDictionary dictionaryWithObject: pp_color[i_type]
                                          forKey: NSForegroundColorAttributeName];
-    o_msg = [[[o_notification userInfo] objectForKey: @"Message"] stringByAppendingString: @"\n"];
-    o_msg_color = [[NSAttributedString alloc]
-                   initWithString: o_msg attributes: o_attr];
+    o_msg = [NSString stringWithFormat:@"%@\n", [[o_notification userInfo] objectForKey: @"Message"]];
+    o_msg_color = [[NSAttributedString alloc] initWithString: o_msg attributes: o_attr];
     [o_msg_arr addObject: [o_msg_color autorelease]];
 
     b_msg_arr_changed = YES;