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commit 20b68535

 upstream.

Header guard is #ifndef, not #ifdef...
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from 3.2 commit 7d4a9eab

)
Signed-off-by: Willy Tarreau <w@1wt.eu>