add chk_mounted in dfs_elm_mount to make sure that there is a valid fat...
add chk_mounted in dfs_elm_mount to make sure that there is a valid fat partition on physical media. git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2248 bbd45198-f89e-11dd-88c7-29a3b14d5316
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