zstd does not accept a block device as input

[kogorman]

I wanted a complete copy of a hard drive before I tried to fix a problem on it, which may or may not have had to do with any recognizable file. Zstd refused because it wasn't a "regurlar file". Of course it wasn't. So I had to pipe input through dd first. Not a big issue, but an annoyance.

Running with -8 -T0 on a core i7 it squashed down to 13% taking jsut over an hour working on a 2TB SSD so yippee for that!!

[felixhandte]

This will be fixed in the 1.5.0 release. Thanks for the report!