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fstype: fix kfs detection (thanks kenji okomoto)

--- a/rc/bin/fstype

+++ b/rc/bin/fstype

@@ -23,9 +23,13 @@

 	echo hjfs

 	exit

 }

+m=`{dd -if $1 -bs 16 -count 1 -skip 16 >[2]/dev/null}

+if(~ $"m 'kfs wren device'){

+	echo kfs

+	exit

+}

 dd -if $1 -count 1 >[2]/dev/null | \

 awk '

-/^kfs/{fs["kfs"]++}

 /^(blocksize|daddrbits|daddrbits|indirblks|dirblks|namelen)/{p[$1]=$2}

 END{

 	ca["fs", "blocksize"] = 4*1024