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/include/ibm/locks.hpp b/include/ibm/locks.hpp
index b39bada..7dccbd8 100644
--- a/include/ibm/locks.hpp
+++ b/include/ibm/locks.hpp
@@ -279,7 +279,7 @@
 {
     for (const auto& id : refRids)
     {
-        if (lockTable.erase(id))
+        if (lockTable.erase(id) != 0U)
         {
             BMCWEB_LOG_DEBUG << "Removing the locks with transaction ID : "
                              << id;