Fixed bug #417.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/stable_2.6.x@5955 35acf78f-673a-0410-8e92-d51de3d6d3f4
Fixed bug bug #418.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/stable_2.6.x@5959 35acf78f-673a-0410-8e92-d51de3d6d3f4