fix: revert unnecessary null check that broke TypeScript

The null check at line 862 was incorrect. That code runs synchronously
(doesn't wait for async loader), so match exists there. Only the async
callback's finally block needs null check for race conditions.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: yanghuidong

packages/router-core/src/load-matches.ts

@@ -859,19 +859,17 @@ const loadRouteMatch = async (
       }
     }
   }
-  const match = inner.router.getMatch(matchId)
-  if (match) {
-    if (!loaderIsRunningAsync) {
-      match._nonReactive.loaderPromise?.resolve()
-      match._nonReactive.loadPromise?.resolve()
-    }
-
-    clearTimeout(match._nonReactive.pendingTimeout)
-    match._nonReactive.pendingTimeout = undefined
-    if (!loaderIsRunningAsync) match._nonReactive.loaderPromise = undefined
-    match._nonReactive.dehydrated = undefined
+  const match = inner.router.getMatch(matchId)!
+  if (!loaderIsRunningAsync) {
+    match._nonReactive.loaderPromise?.resolve()
+    match._nonReactive.loadPromise?.resolve()
   }
 
+  clearTimeout(match._nonReactive.pendingTimeout)
+  match._nonReactive.pendingTimeout = undefined
+  if (!loaderIsRunningAsync) match._nonReactive.loaderPromise = undefined
+  match._nonReactive.dehydrated = undefined
+
   // Commit context now that loader has completed (or was skipped)
   // For async loaders, this was already done in the async callback
   if (!loaderIsRunningAsync) {