Need a line break check before merging several Linux configs

[PKUZHOU]

Recently I was stucked with an odd problem: after modifying the linux kernel it cannot boot properly due to missing "/init" dir which should have been installed via initramfs.

After inspection, I found the root cause is that, I didn't write a line break in my modified linux config , say firechip/base-workloads/br-base/linux-config:

Therefore, after marshal merges this config with initramfs.kfrag, two configs are put into one line, resulting in a failure.

I think we would better have some lines of code to do a line break check before running the config merging. Otherwise some new users may also meet the same problems occationally.