Fix cppcheck warnings

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I18be21d5141630a1da3d5e54740b54a9a06496d9
diff --git a/src/hostSelector_switch.cpp b/src/hostSelector_switch.cpp
index c3ad83f..dbdd836 100644
--- a/src/hostSelector_switch.cpp
+++ b/src/hostSelector_switch.cpp
@@ -37,7 +37,7 @@
 void HostSelector::setInitialHostSelectorValue()
 {
     char buf;
-    for (int index = 0; index < gpioLineCount; index++)
+    for (size_t index = 0; index < gpioLineCount; index++)
     {
         auto result = ::lseek(config.gpios[index].fd, 0, SEEK_SET);
 
@@ -94,7 +94,8 @@
  * init() function can be created to override the default event handling
  */
 
-void HostSelector::handleEvent(sd_event_source* es, int fd, uint32_t revents)
+void HostSelector::handleEvent(sd_event_source* /* es */, int fd,
+                               uint32_t /* revents */)
 {
     int n = -1;
     char buf = '0';