dccp: Return the correct errno code

When kalloc or kmemdup failed, should return ENOMEM rather than ENOBUF.
Signed-off-by: NZheng Yongjun <zhengyongjun3@huawei.com>
Link: https://lore.kernel.org/r/20210204072820.17723-1-zhengyongjun3@huawei.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>

net/dccp/feat.c

@@ -371,7 +371,7 @@ static int dccp_feat_clone_sp_val(dccp_feat_val *fval, u8 const *val, u8 len)
 		fval->sp.vec = kmemdup(val, len, gfp_any());
 		if (fval->sp.vec == NULL) {
 			fval->sp.len = 0;
-			return -ENOBUFS;
+			return -ENOMEM;
 		}
 	}
 	return 0;