gpkg: Fix S_ISLNK usage

Fixes: 320df52 ("gpkg: avoid os.path.islink where lstat is available")
Bug: https://bugs.gentoo.org/942512
Signed-off-by: Zac Medico <[email protected]>

Author: zmedico

lib/portage/gpkg.py

@@ -1943,7 +1943,7 @@ def _check_pre_image_files(self, root_dir, image_prefix="image"):
 
                 file_stat = os.lstat(f)
 
-                if stat.S_ISLNK(file_stat):
+                if stat.S_ISLNK(file_stat.st_mode):
                     path_link = os.readlink(f)
                     path_link_length = len(
                         os.fsencode(path_link)
@@ -2035,7 +2035,7 @@ def _check_pre_quickpkg_files(
 
             file_stat = os.lstat(path)
 
-            if stat.S_ISLNK(file_stat):
+            if stat.S_ISLNK(file_stat.st_mode):
                 path_link = os.readlink(path)
                 path_link_length = len(
                     _unicode_encode(