The fd was passed to strerror instead of the error code.
Also add CALLED() macro to trace function calls in the btrfs code and in
fs_shell (disabled by default but enabled by TRACE defines as usual).
Change-Id: I3b8958679412132349b33d5cd686ddbafc120f1c
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7494
Reviewed-by: Adrien Destugues <[email protected]>
Tested-by: Commit checker robot <[email protected]>