Suppress uninitialized value warnings.

Bug: 263274255
Test: presubmit; make tidy-system_subset
Change-Id: If4b5ad170e91a6b484981094f503b3f81cebe3dd
diff --git a/aosp/update_attempter_android.cc b/aosp/update_attempter_android.cc
index eda82e2..617edab 100644
--- a/aosp/update_attempter_android.cc
+++ b/aosp/update_attempter_android.cc
@@ -324,6 +324,8 @@
   } else {
 #ifdef _UE_SIDELOAD
     LOG(FATAL) << "Unsupported sideload URI: " << payload_url;
+    return false;  // NOLINT, unreached but analyzer might not know.
+                   // Suppress warnings about null 'fetcher' after this.
 #else
     LibcurlHttpFetcher* libcurl_fetcher = new LibcurlHttpFetcher(hardware_);
     if (!headers[kPayloadDownloadRetry].empty()) {