[clang-tidy][NFC] Fix llvm-else-after-return findings

Fix issues found by clang-tidy in clang-tidy source directory.

Author: PiotrZSL

clang-tools-extra/clang-tidy/google/AvoidCStyleCastsCheck.cpp

@@ -58,16 +58,14 @@ static bool pointedUnqualifiedTypesAreEqual(QualType T1, QualType T2) {
 }
 
 static clang::CharSourceRange getReplaceRange(const ExplicitCastExpr *Expr) {
-  if (const auto *CastExpr = dyn_cast<CStyleCastExpr>(Expr)) {
+  if (const auto *CastExpr = dyn_cast<CStyleCastExpr>(Expr))
     return CharSourceRange::getCharRange(
         CastExpr->getLParenLoc(),
         CastExpr->getSubExprAsWritten()->getBeginLoc());
-  }
-  if (const auto *CastExpr = dyn_cast<CXXFunctionalCastExpr>(Expr)) {
+  if (const auto *CastExpr = dyn_cast<CXXFunctionalCastExpr>(Expr))
     return CharSourceRange::getCharRange(CastExpr->getBeginLoc(),
                                          CastExpr->getLParenLoc());
-  } else
-    llvm_unreachable("Unsupported CastExpr");
+  llvm_unreachable("Unsupported CastExpr");
 }
 
 static StringRef getDestTypeString(const SourceManager &SM,

clang-tools-extra/clang-tidy/modernize/LoopConvertCheck.cpp

@@ -375,8 +375,8 @@ static std::optional<ContainerCall> getContainerExpr(const Expr *Call) {
     return ContainerCall{TheCall->getArg(0),
                          TheCall->getDirectCallee()->getName(), false,
                          CallKind};
-
-  } else if (const auto *TheCall = dyn_cast_or_null<CallExpr>(Dug)) {
+  }
+  if (const auto *TheCall = dyn_cast_or_null<CallExpr>(Dug)) {
     if (TheCall->getNumArgs() != 1)
       return std::nullopt;