receiptomatic-www: Use _exit instead of exit in terminate
receiptomatic-www: Use _exit instead of exit in terminate

Use _exit() in the terminate() signal handler, as exit() is
not async-signal-safe.

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

ac000/receiptomatic