receiptomatic: memset the POST buffers
receiptomatic: memset the POST buffers

Initialise the buffers that are used to store the POST data to avoid
left over crap.

Use sizeof(buf) in the memset and fread rather than SQL_MAX

Signed-off-by: Andrew Clayton <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@opentechlabs.co.uk>

ac000/receiptomatic