[clang] [clang-format][NFC] Simplify some logic in BreakableLineCommentSection (PR #148324)

[Björn Schäpers via cfe-commits]

================
@@ -927,14 +927,12 @@ BreakableLineCommentSection::BreakableLineCommentSection(
       }
 
       if (Lines[i].size() != IndentPrefix.size()) {
-        PrefixSpaceChange[i] = FirstLineSpaceChange;
+        assert(Lines[i].size() > IndentPrefix.size());
 
-        if (SpacesInPrefix + PrefixSpaceChange[i] < Minimum) {
-          PrefixSpaceChange[i] +=
-              Minimum - (SpacesInPrefix + PrefixSpaceChange[i]);
-        }
+        PrefixSpaceChange[i] = SpacesInPrefix + FirstLineSpaceChange < Minimum
----------------
HazardyKnusperkeks wrote:

Yeah, I was mistaken.

But, even is not needed, I'd do this:
```suggestion
        PrefixSpaceChange[i] = (SpacesInPrefix + FirstLineSpaceChange < Minimum)
```

https://github.com/llvm/llvm-project/pull/148324
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