Add NXT_UNUSED to silence unused warnings

src/tests/unittests/BitSetIteratorTests.cpp

@@ -51,7 +51,7 @@ TEST_F(BitSetIteratorTest, EmptySet) {
     // causing an unreachable code warning in MSVS
     bool sawBit = false;
     for (unsigned long bit : IterateBitSet(mStateBits)) {
-        (void) bit;
+        NXT_UNUSED(bit);
         sawBit = true;
     }
     EXPECT_FALSE(sawBit);

src/tests/unittests/ErrorTests.cpp

@@ -178,7 +178,7 @@ TEST(ErrorTests, TRY_RESULT_Error) {
     auto Try = [ReturnError]() -> ResultOrError<int*> {
         int* result = nullptr;
         NXT_TRY_ASSIGN(result, ReturnError());
-        (void) result;
+        NXT_UNUSED(result);
 
         // NXT_TRY should return before this point
         EXPECT_FALSE(true);
@@ -233,7 +233,7 @@ TEST(ErrorTests, TRY_RESULT_ConversionToError) {
     auto Try = [ReturnError]() -> MaybeError {
         int* result = nullptr;
         NXT_TRY_ASSIGN(result, ReturnError());
-        (void) result;
+        NXT_UNUSED(result);
 
         return {};
     };

src/tests/unittests/SerialQueueTests.cpp

@@ -27,7 +27,7 @@ TEST(SerialQueue, BasicTest) {
 
     // Iterating on empty queue 1) works 2) doesn't produce any values
     for (int value : queue.IterateAll()) {
-        (void) value;
+        NXT_UNUSED(value);
         ASSERT_TRUE(false);
     }
 
@@ -50,7 +50,7 @@ TEST(SerialQueue, BasicTest) {
     ASSERT_TRUE(queue.Empty());
 
     for (int value : queue.IterateAll()) {
-        (void) value;
+        NXT_UNUSED(value);
         ASSERT_TRUE(false);
     }
 }