authfs: parse command line in a safe manner

Bug: 205750213
Test: see error log in logcat
Change-Id: Iacad446edcedfc5e7fdd15ebb7411dfeedf0335c
diff --git a/authfs/src/main.rs b/authfs/src/main.rs
index f08d9ea..24b041c 100644
--- a/authfs/src/main.rs
+++ b/authfs/src/main.rs
@@ -287,7 +287,7 @@
 }
 
 fn try_main() -> Result<()> {
-    let args = Args::from_args();
+    let args = Args::from_args_safe()?;
 
     let log_level = if args.debug { log::Level::Debug } else { log::Level::Info };
     android_logger::init_once(