netfilter: xt_ipcomp: Use ntohs to ease sparse warning

0-DAY kernel build testing backend reported:

sparse warnings: (new ones prefixed by >>)

>> >> net/netfilter/xt_ipcomp.c:63:26: sparse: restricted __be16 degrades to integer
>> >> net/netfilter/xt_ipcomp.c:63:26: sparse: cast to restricted __be32

Fix this by using ntohs without shifting.

Tested with: make C=1 CF=-D__CHECK_ENDIAN__

Signed-off-by: Fan Du <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

net/netfilter/xt_ipcomp.c

···
 	}
 
 	return spi_match(compinfo->spis[0], compinfo->spis[1],
-			 ntohl(chdr->cpi << 16),
+			 ntohs(chdr->cpi),
 			 !!(compinfo->invflags & XT_IPCOMP_INV_SPI));
 }