Revert "device-crash-test: Ignore errors about a bus not being available"

Revert "device-crash-test: Ignore errors about a bus not being available"

This reverts commit ca89d15f8e42f2e5eac5bd200af38fdbfb32e875.

There is already an entry for this kind of messages earlier in the
ERROR_RULE_LIST - when I added this patch, I just got fooled by
the other errors that occur due to a race between QMP connection
and QEMU terminating early (which still spit out the 'No bus found'
messages in their backtrace), but these other problems have now
fortunately been tackled by John Snow, so we certainly don't need
this duplicated entry here anymore.

Message-Id: <20211112072220.108580-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>