Clear warnings/errors within BN_CTX_DEBUG code sections

Reviewed-by: NTim Hudson <tjh@openssl.org>

crypto/bn/bn_ctx.c

@@ -159,7 +159,7 @@ static void ctxdbg(BN_CTX *ctx)
 	unsigned int bnidx = 0, fpidx = 0;
 	BN_POOL_ITEM *item = ctx->pool.head;
 	BN_STACK *stack = &ctx->stack;
-	fprintf(stderr,"(%08x): ", (unsigned int)ctx);
+	fprintf(stderr,"(%16p): ", ctx);
 	while(bnidx < ctx->used)
 		{
 		fprintf(stderr,"%03x ", item->vals[bnidx++ % BN_CTX_POOL_SIZE].dmax);