Let stat(1) use fdevname(3).
Let stat(1) use fdevname(3).

Because we now have a reliable library function that converts file
descriptors to character device names, let stat(1) use this. This means
it can now do the following:

	$ stat -f %N
	/dev/pts/0

I've changed main() to set file properly, so output() is never called
with file set to NULL.

Approved by:	dougb (older version, still used devname)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase