crash at exit when initseg name is incorrect

[rbouqueau]

$ gpac -i beepbop_dash_track1_1.m4s:initseg=beepbop_dash_track1.mp4 inspect -graph
[IsoMedia] error while opening beepbop_dash_track1.mp4, error=Requested URL is not valid or cannot be found
Filter mp4dmx failed to setup: Requested URL is not valid or cannot be found
[IsoMedia] error while opening beepbop_dash_track1.mp4, error=Requested URL is not valid or cannot be found
Filter mp4dmx failed to setup: Requested URL is not valid or cannot be found
No filter chain found for PID beepbop_dash_track1_1.m4s in filter fin to any loaded filters - NOT CONNECTED
Filter fin failed to setup: Filter not found for the desired type
Segmentation fault

https://github.com/user-attachments/assets/74270824-e996-4ca4-aa54-04f33d0ac94d

[rbouqueau]

Thanks!