nvme-print-json: Update function sigs for !json-c builds

nvme-print-json: Update function sigs for !json-c builds

The json_output_* function got updated, but the !json-c case was not
updated accordingly. Update them now.

Fixes: e853da696ea4 ("nvme-print-json: Add json output result function")
Fixes: 6e3e1cc8d5b2 ("nvme: Add nvme_show_perror to use instead of perror for json output")
Fixes: 2b0bc4d824d0 ("nvme-printf: Add show error function for nvme list command json output")
Signed-off-by: Daniel Wagner <dwagner@suse.de>