libbsd, libtiger: fix meta evaluation

I suppose we'll one day transition to forced automatic checks of some
basic things before pushing/merging.

pkgs/development/libraries/libbsd/default.nix

@@ -20,6 +20,6 @@ stdenv.mkDerivation rec {
     homepage = https://libbsd.freedesktop.org/;
     license = licenses.bsd3;
     platforms = platforms.linux ++ platforms.darwin;
-    maintainers = with maintainer; [ matthewbauer ];
+    maintainers = with maintainers; [ matthewbauer ];
   };
 }

pkgs/development/libraries/libtiger/default.nix

@@ -16,6 +16,6 @@ stdenv.mkDerivation rec {
     homepage = https://code.google.com/archive/p/libtiger/;
     description = "A rendering library for Kate streams using Pango and Cairo";
     platforms = lib.platforms.unix;
-    maintainers = with lib; [ matthewbauer ];
+    maintainers = with lib.maintainers; [ matthewbauer ];
   };
 }