[clang-tidy][NFC] Fix modernize-use-auto findings

Fix issues found by clang-tidy in clang-tidy source directory.
diff --git a/clang-tools-extra/clang-tidy/altera/StructPackAlignCheck.cpp b/clang-tools-extra/clang-tidy/altera/StructPackAlignCheck.cpp
index c3b47d4..cdaedd4 100644
--- a/clang-tools-extra/clang-tidy/altera/StructPackAlignCheck.cpp
+++ b/clang-tools-extra/clang-tidy/altera/StructPackAlignCheck.cpp
@@ -110,7 +110,7 @@
   }
 
   FixItHint FixIt;
-  AlignedAttr *Attribute = Struct->getAttr<AlignedAttr>();
+  auto *Attribute = Struct->getAttr<AlignedAttr>();
   std::string NewAlignQuantity = std::to_string((int)NewAlign.getQuantity());
   if (Attribute) {
     FixIt = FixItHint::CreateReplacement(