crypto: powerpc/sha256-spe - Fix sparse endianness warning

This patch fixes a sparse endianness warning in sha256-spe.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/powerpc/crypto/sha256-spe-glue.c

@@ -177,7 +177,7 @@ static int ppc_spe_sha256_final(struct shash_desc *desc, u8 *out)
 
 static int ppc_spe_sha224_final(struct shash_desc *desc, u8 *out)
 {
-	u32 D[SHA256_DIGEST_SIZE >> 2];
+	__be32 D[SHA256_DIGEST_SIZE >> 2];
 	__be32 *dst = (__be32 *)out;
 
 	ppc_spe_sha256_final(desc, (u8 *)D);