suppress an error message (related to Mac 10.7)

We could try to figure out the current state of the process,
instead, but it seems like too much work.

original commit: 9c5b78e998c7cf3e6a0bfe9848b7a47f18562ef3

collects/mred/private/wx/cocoa/queue.rkt

@@ -108,7 +108,12 @@
                                            -> _OSStatus))
 (let ([v (TransformProcessType (make-ProcessSerialNumber 0 kCurrentProcess)
                                kProcessTransformToForegroundApplication)])
-  (unless (zero? v)
+  (unless (or (zero? v)
+	      ;; As of Mac OS X 10.7, TransformProcessType() complains
+	      ;; if the application is already a foreground application,
+	      ;; so just ignore that error (even though it correctly flagged
+	      ;; a bug in the `_ProcessSerialNumber' definition at one point).
+	      (= v -50))
     (log-error (format "error from TransformProcessType: ~a" v))))
 
 (define app-delegate (tell (tell MyApplicationDelegate alloc) init))