Fixed vlc_cond_wait for windows.

Thanks Courmisch for pointing it.

include/vlc_threads.h

@@ -392,11 +392,11 @@ static inline void __vlc_cond_wait( const char * psz_file, int i_line,
     {
         vlc_testcancel ();
         result = SignalObjectAndWait (*p_mutex, *p_condvar, INFINITE, TRUE);
+    }
+    while (result == WAIT_IO_COMPLETION);
 
     /* Reacquire the mutex before returning. */
     vlc_mutex_lock( p_mutex );
-    }
-    while (result == WAIT_IO_COMPLETION);
 
     vlc_testcancel ();