version_policy: avoid fclose a NULL file pointer

Test: Pass a not cil file to version_policy and see no crash appeared.
example: out/host/linux-x86/bin/version_policy -b  `which ls`  -m -n 10000.0 -o target

Change-Id: If2b950a02dd94a4813b74377617f90c7a75a9f27
Signed-off-by: liwugang <liwugang@xiaomi.com>
1 file changed