bpfloader: sleep 20 seconds on failure

(should make it easier to observe logs via adb)

Test: atest, TreeHugger
Bug: 150040815
Bug: 160546011
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I20d6ede4ddf516a91c707aa08cf3a92aed39b03b
diff --git a/bpfloader/BpfLoader.cpp b/bpfloader/BpfLoader.cpp
index e67c469..5aacf6c 100644
--- a/bpfloader/BpfLoader.cpp
+++ b/bpfloader/BpfLoader.cpp
@@ -89,6 +89,7 @@
         ALOGE("If this triggers randomly, you might be hitting some memory allocation problems or "
               "startup script race.");
         ALOGE("--- DO NOT EXPECT SYSTEM TO BOOT SUCCESSFULLY ---");
+        sleep(20);
         return 2;
     }