Fix warnings in preparation for Rust 1.54.0

This CL fixes several new warnings generated by rustc 1.54.0.

Bug: 194812675
Test: m rust
Change-Id: I104aaf07897db4df89dd1598969dd74221bfdd0b
diff --git a/compos/src/compsvc.rs b/compos/src/compsvc.rs
index 24e52f5..ae242de 100644
--- a/compos/src/compsvc.rs
+++ b/compos/src/compsvc.rs
@@ -82,7 +82,7 @@
         } else {
             vec![]
         };
-        let _pid = jail.run(&self.worker_bin, &inheritable_fds, &args)?;
+        let _pid = jail.run(&self.worker_bin, &inheritable_fds, args)?;
         jail.wait()
     }