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idr_get_next() was accidentally not exported when added.  It is about
to be used by mtdcore, which may be built as a module.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>