Rust: Fix some warnings in the existing test.

Author: geoffw0

rust/ql/test/query-tests/security/CWE-825/deallocation.rs

@@ -29,8 +29,8 @@ pub fn test_alloc(mode: i32) {
 				println!("	v6 = {v6} (!)"); // corrupt in practice
 
 				// test repeat reads (we don't want lots of very similar results for the same dealloc)
-				let v5b = *m1;
-				let v5c = *m1;
+				let _v5b = *m1;
+				let _v5c = *m1;
 			},
 			100 => {
 				// more reads

rust/ql/test/query-tests/security/CWE-825/lifetime.rs

@@ -96,7 +96,7 @@ fn use_pointers(p1: *const i64, p2: *mut i64, mode: i32) {
 	use_the_stack();
 
 	unsafe {
-		if (mode == 0) {
+		if mode == 0 {
 			// reads
 			let v1 = *p1; // GOOD
 			let v2 = *p2; // GOOD
@@ -105,7 +105,7 @@ fn use_pointers(p1: *const i64, p2: *mut i64, mode: i32) {
 			println!("	v2 = {v2}");
 			println!("	v3 = {v3}");
 		}
-		if (mode == 200) {
+		if mode == 200 {
 			// writes
 			*p2 = 2; // GOOD
 		}
@@ -142,14 +142,14 @@ pub fn test_static(mode: i32) {
 	use_the_stack();
 
 	unsafe {
-		if (mode == 0) {
+		if mode == 0 {
 			// reads
 			let v1 = *p1; // GOOD
 			let v2 = *p2; // GOOD
 			println!("	v1 = {v1}");
 			println!("	v2 = {v2}");
 		}
-		if (mode == 210) {
+		if mode == 210 {
 			// writes
 			*p2 = 3; // GOOD
 		}