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nusbrc: handle fat formated usb drives without partition table

on some usb drives, there is no dos partition table, so check
the filesystem type and consider the whole drive.

--- a/sys/src/9/boot/nusbrc

+++ b/sys/src/9/boot/nusbrc

@@ -39,7 +39,7 @@

 					devs=sdU^($1 $5)

 					for(dev in $devs $devs.*) if(test -d $dev) {

 						diskparts $dev

-						for(part in $dev/dos* $dev/9fat) if(test -r $part) {

+						for(part in $dev/dos* $dev/9fat* $dev/data) if(test -r $part && ~ `{fstype $part} dos) {

 							mkdir -m 0700 '#σc/'^$dev || exit

 							{dossrv -s -f $part &} <[0=1] |

 								echo 0 >'#σc/'^$dev/dos