50debug-symbols-check: fix --debug

Quick and dirty fix seems sufficient for this feature.

BUG=b:303235853
TEST=emerge-brya --debug -O usbguard

Change-Id: I8d76de826ca77673cd301058040c612744d5ac7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/portage_tool/+/4909974
Reviewed-by: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
Commit-Queue: Sergey Frolov <sfrolov@google.com>
1 file changed