btrfs.c: fix indentation
btrfs.c: fix indentation

* btrfs.c: Fix indentation of preprocessor directives and print formats.

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