The command rm -f will succeed even if run for a file that does not
exist. Hence it is superfluous to existence check a file that we want
to purge with rm -f, which makes the script a bit simpler to read.

Change-Id: If4eafea568301f418e0dd533e7175781ebf6000a
Signed-off-by: Joakim Roubert <joakimr@axis.com>