kiss: unset variables early

kiss

@@ -336,9 +336,9 @@ pkg_cache() {
 pkg_source_resolve() {
     # Given a line of input from the sources file, return an absolute
     # path to the source if it already exists, error if not.
-    ok "${2##\#*}" || { unset _res _des; return; }
+    unset _res _des _fnr
 
-    unset _des
+    ok "${2##\#*}" || return 0
 
     # Surround each replacement with substitutions to handled escaped markers.
     # First substitution turns '\MARKER' into ' ' (can't appear in sources as