common: hash: Remove a debug printf statement

Remove a left-over debug printf that was introduced with SHA512 support.

Fixes: d16b38f427 ("Add support for SHA384 and SHA512")
Signed-off-by: Harald Seiler <hws@denx.de>

common/hash.c

@@ -146,8 +146,6 @@ static int hash_finish_sha512(struct hash_algo *algo, void *ctx, void
 	if (size < algo->digest_size)
 		return -1;
 
-	printf("hello world\n");
-
 	sha512_finish((sha512_context *)ctx, dest_buf);
 	free(ctx);
 	return 0;