staging/keucr: fix sparse statics and non-ANSI function warnings

Make lots of functions and data static (fixes sparse warnings).
Fix 5 functions to use ANSI format for function parameters (fixes
sparse warnings).

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>