reindent print_macro_definition

I happened to notice that print_macro_definition is indented
improperly.  All the lines were a few extra spaces to the right.

This patch fixes the indentation.
Tested by rebuilding, committed.

2014-05-14  Tom Tromey  <tromey@redhat.com>

	* macrocmd.c (print_macro_definition): Reindent.