Remove some unnecessary try-related type annotations

I left a few, like
```rust
let result: Result<_, ModError<'_>> = try {
```
where it felt like seeing it might still be useful for the reader.

Feel free to push back on any of these changes if you think seeing the type would be better.

compiler/rustc_privacy/src/lib.rs

@@ -1159,14 +1159,14 @@ impl<'tcx> TypePrivacyVisitor<'tcx> {
         let typeck_results = self
             .maybe_typeck_results
             .unwrap_or_else(|| span_bug!(span, "`hir::Expr` or `hir::Pat` outside of a body"));
-        let result: ControlFlow<()> = try {
+        try {
             self.visit(typeck_results.node_type(id))?;
             self.visit(typeck_results.node_args(id))?;
             if let Some(adjustments) = typeck_results.adjustments().get(id) {
                 adjustments.iter().try_for_each(|adjustment| self.visit(adjustment.target))?;
             }
-        };
-        result.is_break()
+        }
+        .is_break()
     }
 
     fn check_def_id(&self, def_id: DefId, kind: &str, descr: &dyn fmt::Display) -> bool {