avfilter: Fix typo in Loren's email address

libavfilter/gradfun.h

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2010 Nolan Lum <nol888@gmail.com>
- * Copyright (c) 2009 Loren Merritt <lorenm@u.washignton.edu>
+ * Copyright (c) 2009 Loren Merritt <lorenm@u.washington.edu>
  *
  * This file is part of Libav.
  *

libavfilter/vf_gradfun.c

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2010 Nolan Lum <nol888@gmail.com>
- * Copyright (c) 2009 Loren Merritt <lorenm@u.washignton.edu>
+ * Copyright (c) 2009 Loren Merritt <lorenm@u.washington.edu>
  *
  * This file is part of Libav.
  *

libavfilter/x86/vf_gradfun.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009 Loren Merritt <lorenm@u.washignton.edu>
+ * Copyright (C) 2009 Loren Merritt <lorenm@u.washington.edu>
  *
  * This file is part of Libav.
  *