Correct fix to find_packages_of().

The previous fix inadvertently removed a "break" statement.
This change restores it.

BUG=chromium:220828
TEST=manually doctor a test to make it crash and hit this statement

Change-Id: I7fe0c3f6c0ee66b476ea55748aad3f331000598a
Reviewed-on: https://chromium-review.googlesource.com/241100
Trybot-Ready: Frank Henigman <[email protected]>
Reviewed-by: Mike Frysinger <[email protected]>
Commit-Queue: Frank Henigman <[email protected]>
Tested-by: Frank Henigman <[email protected]>
diff --git a/server/site_crashcollect.py b/server/site_crashcollect.py
index 335f726..d41e34f 100644
--- a/server/site_crashcollect.py
+++ b/server/site_crashcollect.py
@@ -262,5 +262,6 @@
                     if not package:
                         package = '<unknown package>'
                     logging.info('Would report crash on %s.', package)
+                    break
     except Exception as e:
         logging.warning('Crash detection failed with: %s', e)