Rollup merge of rust-lang#99994 - TaKO8Ki:remove-guess-head-span, r=fee1-dead

Remove `guess_head_span`

follow-up to rust-lang#98519

Author: matthiaskrgr

compiler/rustc_typeck/src/check/_match.rs

@@ -356,13 +356,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             // 6 | |     };
             //   | |_____^ expected integer, found `()`
             // ```
-            if block.expr.is_none() && block.stmts.is_empty() && outer_span.is_some() {
-                let sp = if let Some(cs) = cond_span.find_ancestor_inside(span) {
-                    span.with_hi(cs.hi())
-                } else {
-                    span
-                };
-                outer_span = Some(sp);
+            if block.expr.is_none() && block.stmts.is_empty()
+                && let Some(outer_span) = &mut outer_span
+                && let Some(cond_span) = cond_span.find_ancestor_inside(*outer_span)
+            {
+                *outer_span = outer_span.with_hi(cond_span.hi())
             }
 
             (self.find_block_span(block), block.hir_id)