Increase disk thread stack on the Sansa in line with the changes in r12093.  Fixes the recent Sansa crashes.  Thanks to Rene Peinthor

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12177 a1c6a512-1295-4272-9138-f99709370657
diff --git a/docs/CREDITS b/docs/CREDITS
index 002397b..1641511 100644
--- a/docs/CREDITS
+++ b/docs/CREDITS
@@ -270,3 +270,4 @@
 Albert Veli
 Chris Dohan
 Takashi Obara
+Rene Peinthor