[clang-tidy][NFC] Fix miscellaneous clang-tidy warnings (#170424)

diff --git a/clang-tools-extra/clang-tidy/bugprone/ExceptionEscapeCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/ExceptionEscapeCheck.cpp
index b7de839..1cfb151 100644
--- a/clang-tools-extra/clang-tidy/bugprone/ExceptionEscapeCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/ExceptionEscapeCheck.cpp

@@ -72,7 +72,8 @@
 
 void ExceptionEscapeCheck::registerMatchers(MatchFinder *Finder) {
   auto MatchIf = [](bool Enabled, const auto &Matcher) {
-    ast_matchers::internal::Matcher<FunctionDecl> Nothing = unless(anything());
+    const ast_matchers::internal::Matcher<FunctionDecl> Nothing =
+        unless(anything());
     return Enabled ? Matcher : Nothing;
   };
   Finder->addMatcher(

diff --git a/clang-tools-extra/clang-tidy/modernize/UseStdPrintCheck.h b/clang-tools-extra/clang-tidy/modernize/UseStdPrintCheck.h
index 18cff9a..7d771c4 100644
--- a/clang-tools-extra/clang-tidy/modernize/UseStdPrintCheck.h
+++ b/clang-tools-extra/clang-tidy/modernize/UseStdPrintCheck.h

@@ -36,7 +36,7 @@
   }
 
 private:
-  Preprocessor *PP;
+  Preprocessor *PP = nullptr;
   bool StrictMode;
   std::vector<StringRef> PrintfLikeFunctions;
   std::vector<StringRef> FprintfLikeFunctions;

diff --git a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
index d1583a6..79f8437 100644
--- a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp

@@ -318,8 +318,8 @@
   if (!EOL)
     EOL = Begin + strlen(Begin);
 
-  const char *PosList[] = {strchr(Begin, '='), strchr(Begin, ';'),
-                           strchr(Begin, ','), strchr(Begin, ')'), EOL};
+  const char *const PosList[] = {strchr(Begin, '='), strchr(Begin, ';'),
+                                 strchr(Begin, ','), strchr(Begin, ')'), EOL};
   for (const auto &Pos : PosList) {
     if (Pos > Begin)
       EOL = std::min(EOL, Pos);