Fixing a bug where during the bus_init routine, when a slave is
initialized, the target hardware can get an interrupt, and this can occur
before the target_config structure is assigned; the generic IRQ handler
attempts to use this structure to grab callback function pointers, but
with no target config it attempts to access the structure member from a
null pointer. Fix works by adding ternary operation during IRQ that first
checks if target_config is null or not.
Signed-off-by: Matthew Mulloy Steinborn <mulloystmatthew@meta.com>
f777030898