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dist/qcowfs: fix tests

Giving create OEXCL causes an error if the file already exists.
So we need to clean up previous test disks before attempting to make a new one.

--- a/sys/src/cmd/disk/test/basic.rc

+++ b/sys/src/cmd/disk/test/basic.rc

@@ -4,13 +4,15 @@

 rfork en

 # read fresh disk

-../$O.qcowfs -n 4294967296 /tmp/qcow

+../$O.qcowfs -n 4294967296 /tmp/qcow.$pid

 dd -ibs 389120 -skip 1 -obs 8192 -count 1 < /mnt/qcow/data >/dev/null

-../$O.qcowfs -n 4294967296 /tmp/qcow

+rm -f /tmp/qcow.$pid

+../$O.qcowfs -n 4294967296 /tmp/qcow.$pid

 dd -ibs 389120 -skip 1 -obs 15473 -count 1 < /mnt/qcow/data >/dev/null

 # write

-../$O.qcowfs -n 4294967296 /tmp/qcow

+rm -f /tmp/qcow.$pid

+../$O.qcowfs -n 4294967296 /tmp/qcow.$pid

 dd -ibs 389120 -skip 1 -obs 8192 -count 1 -if /dev/random -of /mnt/qcow/data # start, power of two

 dd -ibs 389120 -skip 1 -obs 15473 -count 1 -if /dev/random -of /mnt/qcow/data # random prime

 dd -ibs 389120 -skip 1 -obs 8192 -seek 524287 -count 1 -if /dev/random -of /mnt/qcow/data  # end

@@ -28,4 +30,5 @@

 	>[1=2] echo mismatched data

 	exit mishash

 }

+rm -f /tmp/qcow.$pid

 exit ''

-- 

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