ScAutoFormatData: Use unique_ptr::get() instead of &*iter

Using &* can be problematic if the pointer is null. In this case I don’t
think it matters, but using unique_ptr::get() is probably easier to
understand anyway. This also paves the way for a later compiler plugin
to check for this.

Change-Id: I6b399d57cdf580d40721789bf3d6e7607c56fd6e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/211751
Tested-by: Jenkins
Reviewed-by: Neil Roberts <nroberts@libreoffice.org>

sc/source/core/tool/autoform.cxx

@@ -367,10 +367,13 @@ ScAutoFormat::~ScAutoFormat() = default;
 
 const ScAutoFormatData* ScAutoFormat::GetData(size_t nIndex) const
 {
-    return &*mpImpl->maAutoFormats[nIndex];
+    return mpImpl->maAutoFormats[nIndex].get();
 }
 
-ScAutoFormatData* ScAutoFormat::GetData(size_t nIndex) { return &*mpImpl->maAutoFormats[nIndex]; }
+ScAutoFormatData* ScAutoFormat::GetData(size_t nIndex)
+{
+    return mpImpl->maAutoFormats[nIndex].get();
+}
 
 bool ScAutoFormat::InsertAutoFormat(SvxAutoFormatData* pFormat)
 {