[CRYPTO] digest: Remove unnecessary zeroing during init

Various digest algorithms operate one block at a time and therefore
keep a temporary buffer of partial blocks.  This buffer does not need
to be initialised since there is a counter which indicates what is and
isn't valid in it.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/tgr192.c

@@ -500,7 +500,6 @@ static void tgr192_init(void *ctx)
 {
 	struct tgr192_ctx *tctx = ctx;
 
-	memset (tctx->hash, 0, 64);
 	tctx->a = 0x0123456789abcdefULL;
 	tctx->b = 0xfedcba9876543210ULL;
 	tctx->c = 0xf096a5b4c3b2e187ULL;