[ostree] ostbuild: Fix error message for unknown builtin

[Colin Walters <walters src gnome org>]

commit e048173c6083d0de52977353baafa927f790dd09
Author: Colin Walters <walters verbum org>
Date:   Sun Jan 29 16:42:54 2012 -0500

    ostbuild: Fix error message for unknown builtin

 src/ostbuild/pyostbuild/builtins.py |    5 ++++-
 src/ostbuild/pyostbuild/main.py     |    2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/ostbuild/pyostbuild/builtins.py b/src/ostbuild/pyostbuild/builtins.py
index ddafbcd..efd8bfc 100755
--- a/src/ostbuild/pyostbuild/builtins.py
+++ b/src/ostbuild/pyostbuild/builtins.py
@@ -47,7 +47,10 @@ def register(builtin):
     _all_builtins[builtin.name] = builtin
 
 def get(name):
-    return _all_builtins.get(name)()
+    builtin = _all_builtins.get(name)
+    if builtin is not None:
+        return builtin()
+    return None
 
 def get_all():
     return _all_builtins.itervalues()
diff --git a/src/ostbuild/pyostbuild/main.py b/src/ostbuild/pyostbuild/main.py
index 4afb450..eccf879 100755
--- a/src/ostbuild/pyostbuild/main.py
+++ b/src/ostbuild/pyostbuild/main.py
@@ -44,7 +44,7 @@ def main(args):
     else:
         builtin = builtins.get(args[0])
         if builtin is None:
-            print "error: Unknown builtin '%s'" % (args[1], )
+            print "error: Unknown builtin '%s'" % (args[0], )
             return usage(1)
         return builtin.execute(args[1:])