eclean: again handle empty invalid binpkgs correctly

_get_size_valid_symlink returns 0 in two cases:
1) when the file is actually of size 0, or
2) a broken symlink was passed.

Hack around case 1) appearing identical to callers by returning 1 there
instead.

Bug: https://bugs.gentoo.org/973294
Signed-off-by: Sam James <sam@gentoo.org>

Author: thesamesam

pym/gentoolkit/eclean/clean.py

@@ -132,7 +132,10 @@ def _get_size_valid_symlink(self, file_):
         try:
             statinfo = os.stat(file_)
             if statinfo.st_nlink == 1:
-                return statinfo.st_size
+                # Hack to disambiguate a file of empty size from the other
+                # case where this function returns 0 at the end for a dead
+                # symlink.
+                return statinfo.st_size or 1
         except OSError as er:
             if os.path.exists(os.readlink(file_)):
                 print(pp.error("Could not get stat info for:" + file_), file=sys.stderr)