Enable readability-implicit-bool-conversion checks

These checks ensure that we're not implicitly converting ints or
pointers into bools, which makes the code easier to read.

Tested:
Ran series through redfish service validator.  No changes observed.
UUID failing in Qemu both before and after.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I1ca0be980d136bd4e5474341f4fd62f2f6bbdbae
diff --git a/src/webserver_main.cpp b/src/webserver_main.cpp
index b613008..b05161d 100644
--- a/src/webserver_main.cpp
+++ b/src/webserver_main.cpp
@@ -40,7 +40,7 @@
     {
         BMCWEB_LOG_INFO << "attempting systemd socket activation";
         if (sd_is_socket_inet(SD_LISTEN_FDS_START, AF_UNSPEC, SOCK_STREAM, 1,
-                              0))
+                              0) != 0)
         {
             BMCWEB_LOG_INFO << "Starting webserver on socket handle "
                             << SD_LISTEN_FDS_START;
@@ -113,7 +113,7 @@
     crow::google_api::requestRoutes(app);
 #endif
 
-    if (bmcwebInsecureDisableXssPrevention)
+    if (bmcwebInsecureDisableXssPrevention != 0)
     {
         cors_preflight::requestRoutes(app);
     }
@@ -128,7 +128,7 @@
 
 #ifndef BMCWEB_ENABLE_REDFISH_DBUS_LOG_ENTRIES
     int rc = redfish::EventServiceManager::startEventLogMonitor(*io);
-    if (rc)
+    if (rc != 0)
     {
         BMCWEB_LOG_ERROR << "Redfish event handler setup failed...";
         return rc;