hmx_upgrade_nvram: send debug output to stderr.

The hnvram command, if anything went wrong (or even a debug info message was
printed) would end up dumping the message to stdout.  Since it's common to
do things like

    var=$(hnvram -qg VARNAME)

This could have really messy results.  Send error and info messages to
stderr where they belong.

Change-Id: Ibc5d42fdffbe00053dfeb31163e48808d3add294
1 file changed
tree: dce44cfe37f49e781bb1fc4bc760f1b4a20ae557
  1. libupgrade/
  2. makehdf