qcacmn: NULL pointer dereference in free_htc_bundle_packet()

Inside free_htc_bundle_packet() if the HTC packet queue
associated with a packet is NULL, a NULL pointer dereference
can occur.

Add check to verify that HTC packet queue is not NULL before
dereferencing.

Change-Id: I1965a66de74b8954fdc59733e5ef86120f4f8898
Crs-Fixed: 2232839