pbsplash: negative scale factor segmentation fault

Describe your issue

pbsplash seems to not handle missing screen dimensions resulting in a black screen on boot.

When running pbsplash via ssh I get

apple-iphone5s:~$ sudo pbsplash -s /usr/share/pbsplash/pmos-logo-text.svg
Got scale factor: -10.621965
Segmentation fault

Supplying the -d option with a correct-ish value to fbsplash actually works.

What's the expected behaviour?

Splash screen works

What's the current behaviour?

Screen turns black on splash, pbsplash segfaults

How to reproduce your issue?

1. Boot the device with netboot hook (simply booting without hook may be enough)
2. Observe as screen turns black when the splash screen should show

What device are you using?

apple-iphone5s (local barely modified clone of apple-iphone6)

I think any simple-framebuffer device will have this problem without dimensions set

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v22.06 (supported until 2023-01-18)

• v22.12

• I confirm that the issue still is present after running sudo apk upgrade -a

On what environment did you encounter the issue?

Environments

• Phosh
• Plasma Mobile
• Sxmo (Wayland/Sway) Please post the output of sxmo_version.sh
• None

Probably any applies, this is not environment specific

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

What's the build date of the image? (in yyyy-mm-dd format)

2023-02-18