crypto: spacc - Check for allocation failure in spacc_skcipher_fallback()

Check for crypto_alloc_skcipher() failure.

Fixes: c8981d92 ("crypto: spacc - Add SPAcc Skcipher support")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/dwc-spacc/spacc_skcipher.c

@@ -67,6 +67,8 @@ static int spacc_skcipher_fallback(unsigned char *name,
 	tctx->fb.cipher = crypto_alloc_skcipher(name,
 						CRYPTO_ALG_TYPE_SKCIPHER,
 						CRYPTO_ALG_NEED_FALLBACK);
+	if (IS_ERR(tctx->fb.cipher))
+		return PTR_ERR(tctx->fb.cipher);
 
 	crypto_skcipher_set_reqsize(reqtfm,
 				    sizeof(struct spacc_crypto_reqctx) +