This changes the macro scope functions (sal_macro_scope,
user_macro_scope, and default_macro_scope) to return a
unique_xmalloc_ptr, then fixes up the users. This allowed for the
removal of several cleanups.
2018-02-08 Tom Tromey <tom@tromey.com>
* symtab.c (default_collect_symbol_completion_matches_break_on):
Use unique_xmalloc_ptr.
* macroscope.h: (sal_macro_scope, user_macro_scope)
(default_macro_scope): Return unique_xmalloc_ptr.
* macroscope.c (sal_macro_scope, user_macro_scope)
(default_macro_scope): Return unique_xmalloc_ptr.
* macroexp.h (macro_expand, macro_expand_once): Return
unique_xmalloc_ptr.
* macroexp.c (macro_expand, macro_expand_once): Return
unique_xmalloc_ptr.
* macrocmd.c (macro_expand_command, macro_expand_once_command)
(info_macro_command, info_macros_command): Use
unique_xmalloc_ptr.
* compile/compile-c-support.c (write_macro_definitions): Use
unique_xmalloc_ptr.
* c-exp.y (c_parse): Use unique_xmalloc_ptr.
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