[clang-tools-extra] [clang-tidy] Add fix-it for C-style cast of nullptr (PR #173159)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang-tools-extra/clang-tidy/modernize/AvoidCStyleCastCheck.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clang-tidy/modernize/AvoidCStyleCastCheck.cpp b/clang-tools-extra/clang-tidy/modernize/AvoidCStyleCastCheck.cpp
index 2e7fc0f36..6c49869cf 100644
--- a/clang-tools-extra/clang-tidy/modernize/AvoidCStyleCastCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/AvoidCStyleCastCheck.cpp
@@ -218,10 +218,11 @@ void AvoidCStyleCastCheck::check(const MatchFinder::MatchResult &Result) {
       ReplaceWithNamedCast("static_cast");
     return;
   case CK_NoOp:
-  if (isa<CXXNullPtrLiteralExpr>(CastExpr->getSubExprAsWritten()->IgnoreImpCasts())) {
-  ReplaceWithNamedCast("static_cast");
-  return;
-}
+    if (isa<CXXNullPtrLiteralExpr>(
+            CastExpr->getSubExprAsWritten()->IgnoreImpCasts())) {
+      ReplaceWithNamedCast("static_cast");
+      return;
+    }
 
     if (FnToFnCast) {
       ReplaceWithNamedCast("static_cast");

``````````

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https://github.com/llvm/llvm-project/pull/173159