[lldb] Unbreak debian build after dd76375

bulbazord · bulbazord · commit 91223c92f7f7 · 2023-10-03T16:11:02.000-07:00
From the lldb-x86_64-debian buildbot:
```
/home/worker/2.0.1/lldb-x86_64-debian/llvm-project/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp:984:16: error: call to deleted constructor of 'llvm::Error'
        return err;
               ^~~
/home/worker/2.0.1/lldb-x86_64-debian/llvm-project/llvm/include/llvm/Support/Error.h:189:3: note: 'Error' has been explicitly marked deleted here
  Error(const Error &amp;Other) = delete;
  ^
/home/worker/2.0.1/lldb-x86_64-debian/llvm-project/llvm/include/llvm/Support/Error.h:496:18: note: passing argument to parameter 'Err' here
  Expected(Error Err)
                 ^
1 error generated.
```
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
@@ -981,7 +981,7 @@ DWARFUnit::extract(SymbolFileDWARF &dwarf, user_id_t uid,
       entry = index.getFromOffset(expected_header->GetOffset());
     if (entry)
       if (llvm::Error err = expected_header->ApplyIndexEntry(entry))
-        return err;
+        return std::move(err);
   }
 
   const llvm::DWARFDebugAbbrev *abbr = dwarf.DebugAbbrev();

Original file line number	Diff line number	Diff line change
`@@ -981,7 +981,7 @@ DWARFUnit::extract(SymbolFileDWARF &dwarf, user_id_t uid,`
`981`	`981`	`entry = index.getFromOffset(expected_header->GetOffset());`
`982`	`982`	`if (entry)`
`983`	`983`	`if (llvm::Error err = expected_header->ApplyIndexEntry(entry))`
`984`		`- return err;`
	`984`	`+ return std::move(err);`
`985`	`985`	`}`
`986`	`986`
`987`	`987`	`const llvm::DWARFDebugAbbrev *abbr = dwarf.DebugAbbrev();`