[LA.UM.7.1.r1] Cope with the non-existence of some of the config files

[pablomh]

In my testing I run into this, which wasn't caught properly:

. . .
Merging arch/arm64/configs/sony/android-extra.config
The merge file 'arch/arm64/configs/sony/android-extra.config' does not exist.  Exit

[MarijnS95]

@pablomh These programs should terminate with a non-zero exit code, right?

Any idea why we're capturing output here and not checking exit code instead?

ie. afaik something like if ! ret=$(the invocation); then echo "Failed with $ret"; exit 1; fi should work, right? Would you be able to test that and remove all these fault-intolerant *error* matches?

[pablomh]

I'm just following the existing code style :/

I agree that it's ugly but didn't want to touch it that much.

[MarijnS95]

@pablomh No worries, I was just hoping if you could test and improve the situation :)