Avoid uninitialized read

[dirkmueller]

irq_info struct is initialized on stack so the members need to be initalized to avoid a crash on uninitialized pointer dereference.

Signed-off-by: Dirk Müller dirk@dmllr.de

[dirkmueller]

this can be easily found by e.g using -fanalyzer:

classify.c: In function ‘check_for_irq_ban’:
classify.c:602:16: warning: use of uninitialized value ‘*irq.name’ [CWE-457] [-Wanalyzer-use-of-uninitialized-value]
  602 |         if (irq->name != NULL && strlen(irq->name) > 0 && check_for_module_ban(irq->name))
      |             ~~~^~~~~~
  ‘rebuild_irq_db’: events 1-2