netfilter: uapi: Avoid undefined left-shift in xt_sctp.h
With 'bytes(__u32)' being 32, a left-shift of 31 may happen which is undefined for the signed 32-bit value 1. Avoid this by declaring 1 as unsigned. Signed-off-by: NPhil Sutter <phil@nwl.cc> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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