fix(dracut.sh): exit if resolving executable dependencies fails

fix(dracut.sh): exit if resolving executable dependencies fails

We came across an issue where, when resolving executable dependencies, a call to
a buggy glib function in `dracut-install` was causing a termination with
SIGSEGV, but dracut didn't stop the build process, which resulted in an
unbootable initrd, due to missing required libraries.

```
dracut: *** Resolving executable dependencies ***
xargs: /usr/lib/dracut/dracut-install: terminated by signal 11
dracut: *** Resolving executable dependencies done ***
```

Therefore, stop the initrd creation in this case.