crypto: algif_skcipher - Pass on error from af_alg_make_sg

The error returned from af_alg_make_sg is currently lost and we
always pass on -EINVAL. This patch pases on the underlying error.

Signed-off-by: Herbert Xu <[e-mail]>

crypto/algif_skcipher.c

···
 				goto unlock;
 
 			used = af_alg_make_sg(&ctx->rsgl, from, used, 1);
-			if (used < 0)
+			err = used;
+			if (err < 0)
 				goto unlock;
 
 			ablkcipher_request_set_crypt(&ctx->req, sg,