Apply clippy::has_significant_drop.

Signed-off-by: Jason Volk <jason@zemos.net>

src/api/router/state.rs

@@ -7,6 +7,7 @@ pub struct State {
 	services: *const Services,
 }
 
+#[clippy::has_significant_drop]
 pub struct Guard {
 	services: Arc<Services>,
 }

src/core/log/capture/guard.rs

@@ -3,6 +3,7 @@ use std::sync::Arc;
 use super::Capture;
 
 /// Capture instance scope guard.
+#[clippy::has_significant_drop]
 pub struct Guard {
 	pub(super) capture: Arc<Capture>,
 }

src/core/utils/mutex_map.rs

@@ -16,6 +16,7 @@ pub struct MutexMap<Key, Val> {
 }
 
 #[derive(Debug)]
+#[clippy::has_significant_drop]
 pub struct Guard<Key, Val> {
 	map: Map<Key, Val>,
 	val: Omg<Val>,

src/core/utils/two_phase_counter.rs

@@ -47,6 +47,7 @@ pub struct State<F: Fn(u64) -> Result + Sync> {
 	release: F,
 }
 
+#[clippy::has_significant_drop]
 pub struct Permit<F: Fn(u64) -> Result + Sync> {
 	/// Link back to the shared-state.
 	state: Arc<Counter<F>>,

src/database/cork.rs

@@ -2,6 +2,7 @@ use std::sync::Arc;
 
 use crate::{Database, Engine};
 
+#[clippy::has_significant_drop]
 pub struct Cork {
 	engine: Arc<Engine>,
 	flush: bool,