clang-tidy: Enable readability-string-compare check

Finds string comparisons using the compare method.

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I78c904bca4724e84aa3999d9f34ed66b567af984
diff --git a/fault-monitor/fru-fault-monitor.cpp b/fault-monitor/fru-fault-monitor.cpp
index cf64862..e67ffb4 100644
--- a/fault-monitor/fru-fault-monitor.cpp
+++ b/fault-monitor/fru-fault-monitor.cpp
@@ -167,7 +167,7 @@
 
     for (const auto& item : assocs)
     {
-        if (std::get<1>(item).compare(CALLOUT_REV_ASSOCIATION) == 0)
+        if (std::get<1>(item) == CALLOUT_REV_ASSOCIATION)
         {
             removeWatches.emplace_back(
                 std::make_unique<Remove>(bus, std::get<2>(item)));
@@ -242,7 +242,7 @@
 
         for (const auto& item : assocs)
         {
-            if (std::get<1>(item).compare(CALLOUT_REV_ASSOCIATION) == 0)
+            if (std::get<1>(item) == CALLOUT_REV_ASSOCIATION)
             {
                 removeWatches.emplace_back(
                     std::make_unique<Remove>(bus, std::get<2>(item)));