[binutils-gdb] Remove a warning from symtab.c

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT ae73e2e2435cb706b18ba05734aee4137a271b3c ***

Author: Tom Tromey <tom@tromey.com>
Branch: master
Commit: ae73e2e2435cb706b18ba05734aee4137a271b3c

Remove a warning from symtab.c

When building symtab.c, I get:

../../binutils-gdb/gdb/language.h: In function void print_symbol_info(search_domain, symbol*, int, const char*):
../../binutils-gdb/gdb/language.h:738:20: warning: *((void*)& l +4) may be used uninitialized in this function [-Wmaybe-uninitialized]
       set_language (m_lang);
       ~~~~~~~~~~~~~^~~~~~~~
../../binutils-gdb/gdb/symtab.c:4613:41: note: *((void*)& l +4) was declared here
   scoped_switch_to_sym_language_if_auto l (sym);
                                         ^

This is another instance of the std::optional problem, see
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80635.

However, it seemed straightforward and inexpensive to me to silence
this one, which is what this patch does.

gdb/ChangeLog
2019-01-23  Tom Tromey  <tom@tromey.com>

	* language.h (class scoped_switch_to_sym_language_if_auto):
	Initialize m_lang in both cases.