configfs: Convert subsystem semaphore to mutex
Convert the su_sem member of struct configfs_subsystem to a struct mutex, as that's what it is. Also convert all the users and update Documentation/configfs.txt and Documentation/configfs_example.c accordingly. [ Conflict in fs/dlm/config.c with commit 3168b078 manually resolved. --Mark ] Inspired-by: NSatyam Sharma <ssatyam@cse.iitk.ac.in> Signed-off-by: NJoel Becker <joel.becker@oracle.com> Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
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