btrfs: use file:line format for assertion report

The filename:line format is commonly understood by editors and can be
copy&pasted more easily than the current format.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-05-30 18:43:53 +02:00
commit 6f8e4fd430