TEST-58: remove stale artifacts to not fail on repeated invocations

We would remove stuff only if successful, so repeated invocations would
trivially fail.

Also drop "-f", so that if we expect to remove something, it must be there.

test/units/testsuite-58.sh

@@ -5,6 +5,7 @@ set -o pipefail
 export SYSTEMD_LOG_LEVEL=debug
 export PAGER=cat
 
+rm -f /var/tmp/testsuite-58.img /var/tmp/testsuite-58.2.img /tmp/testsuite-58.dump
 mkdir -p /tmp/testsuite-58-defs/
 
 # First part: create a disk image and verify its in order
@@ -74,8 +75,8 @@ systemd-repart --definitions=/tmp/testsuite-58-defs/ \
 
 cmp /var/tmp/testsuite-58.img /var/tmp/testsuite-58.2.img
 
-rm -f /var/tmp/testsuite-58.img /var/tmp/testsuite-58.2.img /tmp/testsuite-58.dump
-rm -rf /tmp/testsuite-58-defs/
+rm /var/tmp/testsuite-58.img /var/tmp/testsuite-58.2.img /tmp/testsuite-58.dump
+rm -r /tmp/testsuite-58-defs/
 
 echo OK >/testok