[lldb] Fix misleading indentation in ABISysV_x86_64.cpp (#2946)

Pre-emptive fix for [eventual use of](https://reviews.llvm.org/D102092) `-Wmisleading-indentation`.

See also #2928.

(cherry picked from #2935)

Author: kastiglione

lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp

@@ -1147,14 +1147,14 @@ ValueObjectSP ABISysV_x86_64::GetReturnValueObjectImpl(
         }
 
         if (!already_copied) {
-        // These two tests are just sanity checks.  If I somehow get the type
-        // calculation wrong above it is better to just return nothing than to
-        // assert or crash.
-        if (!copy_from_extractor)
-          return return_valobj_sp;
-        if (copy_from_offset + field_byte_width >
-            copy_from_extractor->GetByteSize())
-          return return_valobj_sp;
+          // These two tests are just sanity checks.  If I somehow get the type
+          // calculation wrong above it is better to just return nothing than to
+          // assert or crash.
+          if (!copy_from_extractor)
+            return return_valobj_sp;
+          if (copy_from_offset + field_byte_width >
+              copy_from_extractor->GetByteSize())
+            return return_valobj_sp;
 
           copy_from_extractor->CopyByteOrderedData(
               copy_from_offset, field_byte_width,