fixup! has-rust-patches doesn't make sense to set for managed submo…

…dules

src/bootstrap/config.rs

@@ -1516,7 +1516,7 @@ impl Config {
                 }
                 if let Some(patches) = cfg.llvm_has_rust_patches {
                     assert!(
-                        config.submodules.is_some(),
+                        config.submodules.is_none(),
                         "cannot set `llvm-has-rust-patches` for a managed submodule"
                     );
                     target.llvm_has_rust_patches = Some(patches);