meta.sourceProvenance: inline hasSourceProvenance

it may be what the license handling code does, but it's confusing and not very useful

Co-authored-by: Adam Joseph <54836058+a-m-joseph@users.noreply.github.com>

pkgs/stdenv/generic/check-meta.nix

@@ -89,13 +89,11 @@ let
     allowInsecurePredicate attrs ||
     builtins.getEnv "NIXPKGS_ALLOW_INSECURE" == "1";
 
-  hasSourceProvenance = attrs:
-    attrs ? meta.sourceProvenance;
 
   isNonSource = sourceTypes: lib.lists.any (t: !t.isSource) sourceTypes;
 
   hasNonSourceProvenance = attrs:
-    hasSourceProvenance attrs &&
+    (attrs ? meta.sourceProvenance) &&
     isNonSource (lib.lists.toList attrs.meta.sourceProvenance);
 
   # Allow granular checks to allow only some non-source-built packages