perf hists browser: Use sort__has_sym

The TUI hist browser had a similar variable has_symbols for the same
purpose. Let's get rid of the duplication.

Signed-off-by: Namhyung Kim <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/ui/browsers/hists.c

···
 	struct map_symbol   *selection;
 	int		     print_seq;
 	bool		     show_dso;
-	bool		     has_symbols;
 };
 
 extern void hist_browser__init_hpp(void);
···
 		browser->b.refresh = hist_browser__refresh;
 		browser->b.seek = ui_browser__hists_seek;
 		browser->b.use_navkeypressed = true;
-		if (sort__mode == SORT_MODE__BRANCH)
-			browser->has_symbols = sort_sym_from.list.next != NULL;
-		else
-			browser->has_symbols = sort_sym.list.next != NULL;
 	}
 
 	return browser;
···
 			 */
 			goto out_free_stack;
 		case 'a':
-			if (!browser->has_symbols) {
+			if (!sort__has_sym) {
 				ui_browser__warning(&browser->b, delay_secs * 2,
 			"Annotation is only available for symbolic views, "
 			"include \"sym*\" in --sort to use it.");
···
 			continue;
 		}
 
-		if (!browser->has_symbols)
+		if (!sort__has_sym)
 			goto add_exit_option;
 
 		if (sort__mode == SORT_MODE__BRANCH) {