Remove some debugging printf() call

docs/readme.txt

@@ -6,7 +6,7 @@ AMD GPUs on Linux require "AMDGPU-Pro Driver" (16.40 or later)
 Intel CPUs require "OpenCL Runtime for Intel Core and Intel Xeon Processors" (16.1.1 or later)
 Intel GPUs on Windows require "OpenCL Driver for Intel Iris and Intel HD Graphics"
 Intel GPUs on Linux require "OpenCL 2.0 GPU Driver Package for Linux" (2.0 or later)
-NVIDIA GPUS require "NVIDIA Driver" (367.x or later)
+NVIDIA GPUs require "NVIDIA Driver" (367.x or later)
 
 ##
 ## Features

tools/test.pl

@@ -8009,8 +8009,6 @@ END_CODE
 
     my $tmp = hmac ($pbkdf1_salt_buf, $word_buf, \&sha1, 64);
 
-print unpack ("H*", $tmp), "\n";
-
     for (my $r = 1; $r < $iterations; $r++)
     {
       $tmp = hmac ($tmp, $word_buf, \&sha1, 64);