PVS-Studio warning V595 for Clang

Instruction *InstCombiner::visitGetElementPtrInst(
                             GetElementPtrInst &GEP) {
  ...
  Value *StrippedPtr = PtrOp->stripPointerCasts();
  PointerType *StrippedPtrTy =
    dyn_cast<PointerType>(StrippedPtr->getType());

  if (!StrippedPtr)
    return 0;
  ...
}

This suspicious code was found in Clang project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'StrippedPtr' pointer was utilized before it was verified against nullptr. Check lines: 918, 920. LLVMInstCombine instructioncombining.cpp 918

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