Apply clang-tidy fixes for llvm-qualified-auto in VectorToGPU.cpp (NFC)

Author: joker-eph

mlir/lib/Conversion/VectorToGPU/VectorToGPU.cpp

@@ -557,7 +557,7 @@ convertTransferReadOp(RewriterBase &rewriter, vector::TransferReadOp op,
   auto elType = op.getVectorType().getElementType();
   const char *fragType = inferFragType(op);
   if (op->hasOneUse()) {
-    auto user = *op->user_begin();
+    auto *user = *op->user_begin();
     // Infer the signedness of the mma type from the integer extend.
     bool isSignedExtend = isa<arith::ExtSIOp>(user);
     if (isSignedExtend || isa<arith::ExtUIOp>(user)) {