flowcombiner: update_pad_flow should check that the pad is inside the combiner

Submitted by Xabier Rodríguez Calvar @calvaris

Assigned to Xabier Rodríguez Calvar @calvaris

Link to original bug (#796794)

Description

Created attachment 373000
patch

Currently it is not doing that and that can create issues

Patch 373000, "patch":
0001-flowcombiner-update_pad_flow-check-for-the-pad-to-ha.patch