[CRYPTO]: Fix zero-extension bug on 64-bit architectures.

Noticed by Ken-ichirou MATSUZAWA.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/crypto/internal.h b/crypto/internal.h
index 6861287..37515be 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -75,7 +75,7 @@
 	
 	switch (flags & CRYPTO_TFM_MODE_MASK) {
 	case CRYPTO_TFM_MODE_CBC:
-		len = ALIGN(len, alg->cra_alignmask + 1);
+		len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
 		len += alg->cra_blocksize;
 		break;
 	}