sw64: fix __csum_and_copy when dest is not 8-byte aligned

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I56W9F

--------------------------------

When destination is not 8-byte aligned,
csum_partial_cfu_dest_unaligned() should be used to avoid kernel
unaligned exception.

Fixes: 2fcadd2861b4 ("sw64: optimize ip checksum calculation")
Signed-off-by: NMao Minkai <maominkai@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>

arch/sw_64/lib/csum_partial_copy.c

@@ -128,9 +128,9 @@ static __wsum __csum_and_copy(const void __user *src, void *dst, int len)
 			(const unsigned long __user *) src,
 			(unsigned long *) dst, len-8);
 	} else {
-		checksum = csum_partial_cfu_dest_aligned(
+		checksum = csum_partial_cfu_dest_unaligned(
 			(const unsigned long __user *) src,
-			(unsigned long *) dst, len-8);
+			(unsigned long *) dst, doff, len-8);
 	}
 	return (__force __wsum)from64to16(checksum);
 }