Fixed leak in tests.c according to valgrind's run

Author: gfoidl

src/libraries/Native/Unix/System.Native/tests.c

@@ -11,7 +11,6 @@
 struct state
 {
     HostEntry entry;
-    char* hostName;
     int errorCode;
     sem_t semaphore;
 };
@@ -65,6 +64,7 @@ int main(int argc, char** argv)
     }
 
     struct state state;
+    memset(&state.entry, 0, sizeof(HostEntry));
     sem_init(&state.semaphore, 0, 0);
 
     int error = SystemNative_GetHostEntryForNameAsync((uint8_t*)hostName, &state.entry, callback);
@@ -80,6 +80,8 @@ int main(int argc, char** argv)
     sem_wait(&state.semaphore);
     sem_destroy(&state.semaphore);
 
+    SystemNative_FreeHostEntry(&state.entry);
+
     printf("(%lu) main: exit, errorCode: %d\n", pthread_self(), state.errorCode);
 
     return state.errorCode;