tests/btrfs.c: fix indentation
tests/btrfs.c: fix indentation

* tests/btrfs.c: Fix indentation of preprocessor directives
and function prototypes.

Saruta/strace,cuviper/strace,cuviper/strace,cuviper/strace,Saruta/strace,cuviper/strace,Saruta/strace,Saruta/strace,Saruta/strace,cuviper/strace