tools/syz-declextract: fix struct name in some cases

Remove const/volatile qualifiers from types before generating name.
Currently for some kernel I am getting this otherwise:

const sigset_t$auto_record {
	sig intptr
}

__aio_sigset$auto_record {
	sigmask ptr[in, const sigset_t$auto_record]
	sigsetsize intptr
}

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/syz-declextract/syz-declextract.cpp b/tools/syz-declextract/syz-declextract.cpp
index f39d8f143..b731adf59 100644
--- a/tools/syz-declextract/syz-declextract.cpp
+++ b/tools/syz-declextract/syz-declextract.cpp
@@ -370,7 +370,7 @@ public:
   std::string getFieldType(const QualType &fieldType, ASTContext *context, const std::string &fieldName,
                            const std::string &parent = "", bool isSyscallParam = false,
                            const std::string &fieldTypeName = "") {
-    const auto &field = fieldType.IgnoreParens().getDesugaredType(*context);
+    const auto &field = fieldType.IgnoreParens().getUnqualifiedType().getDesugaredType(*context);
     switch (fieldType.IgnoreParens()->getTypeClass()) {
     case clang::Type::Record: {
       std::string backupName;