perf top: Cleanup condition in perf_top__record_precise_ip()

The 'he' cannot be NULL since it's caller hist_iter__top_callback() is
called only if iter->he is not NULL (see hist_entry_iter__add).  So
setting 'sym' before the condition to simplify the code.

Also make it clearer that the top->symbol_filter_entry check is only
meaningful on stdio mode (i.e. when use_browser is 0).
Signed-off-by: NNamhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1449802616-16170-4-git-send-email-namhyung@kernel.org
[ Complete the simplification replacing one more he->ms.sym with sym ]
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-top.c

@@ -175,15 +175,14 @@ static void perf_top__record_precise_ip(struct perf_top *top,
 					int counter, u64 ip)
 {
 	struct annotation *notes;
-	struct symbol *sym;
+	struct symbol *sym = he->ms.sym;
 	int err = 0;
 
-	if (he == NULL || he->ms.sym == NULL ||
-	    ((top->sym_filter_entry == NULL ||
-	      top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
+	if (sym == NULL || (use_browser == 0 &&
+			    (top->sym_filter_entry == NULL ||
+			     top->sym_filter_entry->ms.sym != sym)))
 		return;
 
-	sym = he->ms.sym;
 	notes = symbol__annotation(sym);
 
 	if (pthread_mutex_trylock(&notes->lock))